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Should I Leave Interior Doors Open Or Closed During Heating And Cooling?

July 1, 2021

We may be biased, but we think that air conditioning is one of the best inventions of the modern era. It keeps you cool and comfortable, no matter how high the temperatures get during our Los Angeles summers. If you’re looking for ways to get the most out of your cooling system, those articulating partitions (AKA doors) throughout your home may pique your interest. So, should you leave doors open or closed when the air conditioning is running? 

Keep Doors Open While HVAC is Running For Best Results

Here’s a basic principle of HVAC that’s helpful in answering this question: the air in your home is continuously recirculating through your HVAC system. Keeping the path of airflow completely open will ensure your unit operates at its best. Closing doorways will restrict the movement of airflow, limiting the path air can travel to the undercut of the door and between any joints. When doors are open, air can travel more freely throughout your home. 

Here’s another way to think about it. Think about blowing up a balloon for a birthday party. You start by holding the balloon’s opening to your lips with your fingers. When the distance between your two fingers is wider, the air from your mouth will fill the balloon quickly and smoothly. The tighter you hold the balloon’s opening, it becomes more difficult to inflate the balloon if you’re blowing with the same force as before. 

In general, keeping doors open will improve airflow through your house during air conditioning.

When To Keep Doors Shut During Air Conditioning

There are some cases where you should keep doors shut during air conditioning. 

One scenario is a room that you do not want or need air conditioning in, such as a closet. Keeping these doors closed during air conditioning will limit the airflow to them. That can save you a small amount of money in energy bills, but keep in mind that sometimes you want cool air to circulate in these spaces. For one, air conditioning can help with humidity control. If the space you don’t need cooling in has a supply air vent, consider shutting off the vent which will help redirect airflow to other spaces. Do this with caution, as closing an air vent changes the balance of airflow in your system, and could cause other performance problems. 

Another scenario where you should keep your doors shut while the air conditioner is operating is during sleeping hours. Keeping doors closed when you are asleep is an important fire safety precaution. According to Underwriters Laboratories, 50% of house fires happen between 11pm at 7am. A closed door can reduce fire growth, limit damage to your home, keep temperatures down, and most importantly, save your life in the event you become trapped. So, make sure you close before you doze.

Follow Us for More Tips

Enjoy home improvement tips? Follow our blog for the latest in industry news and timely tips for Los Angeles residents. You can also follow us on Facebook for exclusive access to our latest specials and promos, along with a laugh or two.  And as always, if you need help with your air conditioning system, trust the experts at Brody Pennell who have been serving the area since 1945. Contact us anytime! 

Editor’s note: this blog was originally published in May 2015 and has been updated for content and accuracy.


About The Author

Brody Pennell

Since 1945, Brody Pennell Heating & Air Conditioning is the committed to helping homeowners in the greater Los Angeles area experience total home comfort. In 2021, the readers of the Los Angeles Times voted Brody Pennell the Best HVAC Company in the area.

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Mario M.
1713396460
Cesar C. & Juancho came out to repair my blower. Very professional technicians. They showed up on time and were successful with the install of the new parts. They tested the heater and AC before they left the house and made sure I was satisfied with their work. We’re happy and staying cool. Great job!
Deb R.
1713390969
Iftki and Angel O. were great 👍. If I need future service, I'm definitely requesting those 2 guys. They were very polite and kept me informed on what they were doing.
Esther N.
1713388204
Kevin Lopez was friendly efficient and knowledgable. He was fantastic. Thank you
OLIVIA A.
1713387848
Marcus was very professional, personable and thorough. He listened patiently and understood my concerns. Because of Marcus I have decided to replace my HVAC with Brody Pennell. He is an outstanding representative of your company.
David W.
1713386688
Giovanni did a very good job. He was on time, efficient and courteous, like all the Brody Pennell employees I've worked with have been.
Mary G.
1713386077
Rodrigo was at my house today,and he was fantastic!! On time and was very professional, and was able to answer all of my concerns today. Rodrigo had a lot of good suggestions!04/17/2024Ruben came out today for a maintenance inspection. He was very professional and friendly. He also explained a purifier system and how it works. Ruben had a lot of good suggestions! Thank you Ruben!
Steve A.
1713384782
HVAC above all, on time, respectful, knowledgeable - great team Daniel A & Hilton K
June M.
1713384246
Anthony Manzo and David E. are the best. They explained everything and were extremely professional. 5 Stars!!
Rori H.
1713379119
Thanks to all of the workers: Frank, Pascal, Jonathon, Ramiro, Jose Rivera, and Alessandro, that assisted in the new A/C, combustion vent addition, and small ventilation repair. On time, patient, and knowledgeable!
victoria F.
1713378557
Alessandro and jose rivera did a fantastic job! Thank you!
Jeff B.
1713378541
Louise G
1713312082
Superb service and very efficientAlex was an excellent technician…he was very knowledgeable and friendly and very helpfulUpdate 4/16: Kevin and Angel were wonderful, very helpful and knowledgeable. Will definitely ask for them again.
Estela N.
1713307133
Jose Rivera was helpful and fixed the issue with my new key pad and pump quickly and efficiently. He also made sure the remote access was working.
Maura L.
1713305706
Very knowledgeable and helpful!
Valencia M.
1713305546
Juan Molina was very thorough in his assessment of our heaters conditions. Was prompt and courteous.
Adam C.
1713305048
Great service from Michael I., Raul I., Jonathan A., Edwin C., Ramiro S. and Jesus F. -- excellent work done efficiently!
Israel
1713304719
RENÉ IS GREAT .
Cary T.
1713297820
Leo H and Tristen C were great!! Explained everything. Most important they did a terrific job!
Nancy H.
1713291151
Excellent work from both Stevens and David E. They did very thorough maintenance cleanup and before and after photos made it clear how necessary it is to do the twice yearly maintenance - will clearly keep system running at peak performance. Would recommend these two highly.
Bill B.
1713232027
Our technician Leonel was thorough in both accomplishing his goal of performing the seasonal tune-up on our system and updating my wife and me as to the overall health of our system. I found him to be competent, polite and trustworthy.
Egisia M El Basha H.
1713225482
Jose R.Pascul HGets on CRafa BPablo P. All excellent
Lauren K.
1713222854
Daniel B. went above and beyond fixing my air conditioning equipment today. He explained everything to me and made sure I knew exactly what he was doing throughout the process. My issue was tricky and he was able to figure it out and fix everything. Daniel is also incredibly kind and personable and made the process easy for me. I am completely satisfied with the service and will be contacting Daniel again for all my HVAC needs!
Mary H L.
1713221057
Ariel A. performed outstanding services! It was his first visit and he asked for an orientation which I thought was a very good approach. He wanted to make sure that he covered all the areas. We have been a customer of Brody Pennell for more than 30 years, and I can honestly say this young man is in the top 10% of the employees who have had the opportunity to service our home.
Margaret G.
1713219070
These guys are total pros. They know what they are doing and they explain everything clearly and the pricing is very transparent. Ivan and Jose C. are very friendly and efficient. I have just had a second very great experience with Armando. He came to maintain the heating system and was very thorough and efficient.4/15/2024: Ruben and Phil just came by to do maintenance on my ac system. They were so friendly and explained everything really well. They inspired total confidence. Another great Brody Pennell experience.
Rinzai-ji Zen C.
1713212152
We appreciate your recommendation of Ken. He demonstrated diligence and honesty throughout his time with us. I eagerly anticipate receiving the quote and reviewing its details. We look forward to the possibility of collaborating with Ken in the near future.
Andrea S.
1713210077
Jason, Hilton, And Leo were great. Polite and neat. All is well.
Michael C.
1713206188
Very professional and knowledgeable. We think the problem was solved due to high heat. Thank you
justin H.
1713205580
Armando and Benny were great. Highly recommend!
Mycroft
1713132842
Our old furnace was about at the end of its life. After discussion with our favorite technician Marco Ayala we decided to have a heat pump installed. A crew arrived this morning headed by Edwin Cabra. He was assisted by Diego B, S. Ramiro, Edgar H, Jonathan A. This team was well trained, worked well together and was finished this afternoon! Great job by all. That's why we have been customers for more than 15 years!!Update: there was a small issue with one of the wires. Ruben Medina found the issue and corrected it. Again Brody Pennell to the rescue! Thank you again!!Further update. Giovanny Quinterro found that the outlet being used had no power. He changed the outlet and we're back to having heat. Yay! Thank you once again!!
Daniel D.
1713054294
Diego B., Sergio S., Alberto H,. And Alex S. installed a brand new system in one of my units and replaced the piping. They took a job that's usually 2 days and did it in 6 hours. They were unobtrusive to the tenants, thorough, and genuinely nice guys. Works perfectly. Extra kudos to the guys for being cool with a couple of very friendly dogs that like to jump and lick. 10/10 would recommend.
Therese B.
1712963432
I just had David Mares here to service the A/C system that they installed 2 years ago. David was great at explaining all the pertinent information about the function and cleaning of my A/C / heating system. He took pictures to show me whatever potential issues there may be down the road. I would highly recommend Brody Pennell for the A/C / heating system and specifically David Mares as a technician.
Dominique Z.
1712961408
Juan Molina was wonderful and so helpful
Baden S.
1712961375
Ruben and Leo M were so great. So professional. So friendly. Great to work with
Jeff T.
1712961025
We just bought a complete HVAC system from Marcus at Brody Pennell and I've never felt better about a manager or a company, and I'm an exacting retired general contractor. Clear choices with zero pressure or upsellng, and character as solid as their well respected company, with the resources to back it up. Marcus was impressive with his expertise, and genuine honesty well beyond that of a company representative, as the kind of person you'd look for in a friend, who seems every bit as stable as this well established company. A real pleasure!
Nancy T.
1712960484
Kevin and David provided amazing customer service for our home in Beverly Hills. They were detailed, thorough, and did not try to rush through our appointment. I received text messages from David throughout their 3 hour visit with photos of the condition of our HVAC, areas of concern, and proof of filter changes! You really can't ask for more. These guys are the best and I would highly recommend them to anyone who needs HVAC maintenance/cleaning.
Nili H.
1712957739
Juan Romo was my technician. He was on time, thoughtful, clean and thorough. He was also very knowledgeable and answered my questions in detail. He took his time and didn’t rush. I’m always delighted with Brody Pennel’s service and recommend them highly. Today I had another service called by Ivan and Hilton And they were wonderful. Gave me a beautiful service and cleaned up as they went and tried to sell me a new filter which I’m for air purification
Joel S.
1712954903
Excellent service from Daniel and Maurice.
Kimberly A.
1712954768
Anthony Manzo was a very thorough and efficient technician. He was very helpful and I would highly recommend him .
Eric B.
1712952256
Once again, excellent service from Brody Pennell. David M. was great—helpful, friendly, and informative.
reyna C.
1712945385
Iván & Hilton were great !
Mike
1712944410
I signed up for a Brody Pennell service plan after they fixed my AC issue last year. I was very impressed with the easy scheduling and responsiveness from the team. Leo H. And Freddy came out today to do my annual AC maintenance, and they did another great job. I highly recommend working with this company!
Donna G.
1712884929
Very courteous, very professional and very thorough and clear in explaining all details.
william C.
1712878629
David Mares and Fabio Gomez were outstanding. Very detail oriented.
Angela B.
1712878029
Ariel A did my semiannual maintenance today. I was very pleased with how thorough he was throughout the process. He addressed Al, of my concerns.
samantha V.
1712873936
Last week we had Brody Pennell come and replace our heating system, I am glad that they sent an amazing crew. Rafael B, Rosendo V, Alessandro A, Nicolas and Jose Manuel. Very happy with the Company and their workers.
john D.
1712868398
My furnace would not start this am. I called for service at 9 am and Jose Rivera and Paul Pacheco arrived a few hours later. They diagnosed the problem as a flaky thermostat unit and replaced it. All if well now. Definitely 5 stars.
m T.
1712866112
Anthony Manzo any David Mares were great - a pleasure to work with. Knowledgeable professionals and nice guys. They did great work and we will request them for our next service.
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Mario M.
1713396460
Cesar C. & Juancho came out to repair my blower. Very professional technicians. They showed up on time and were successful with the install of the new parts. They tested the heater and AC before they left the house and made sure I was satisfied with their work. We’re happy and staying cool. Great job!
Deb R.
1713390969
Iftki and Angel O. were great 👍. If I need future service, I'm definitely requesting those 2 guys. They were very polite and kept me informed on what they were doing.
Esther N.
1713388204
Kevin Lopez was friendly efficient and knowledgable. He was fantastic. Thank you
OLIVIA A.
1713387848
Marcus was very professional, personable and thorough. He listened patiently and understood my concerns. Because of Marcus I have decided to replace my HVAC with Brody Pennell. He is an outstanding representative of your company.
David W.
1713386688
Giovanni did a very good job. He was on time, efficient and courteous, like all the Brody Pennell employees I've worked with have been.
Mary G.
1713386077
Rodrigo was at my house today,and he was fantastic!! On time and was very professional, and was able to answer all of my concerns today. Rodrigo had a lot of good suggestions!04/17/2024Ruben came out today for a maintenance inspection. He was very professional and friendly. He also explained a purifier system and how it works. Ruben had a lot of good suggestions! Thank you Ruben!
Steve A.
1713384782
HVAC above all, on time, respectful, knowledgeable - great team Daniel A & Hilton K
June M.
1713384246
Anthony Manzo and David E. are the best. They explained everything and were extremely professional. 5 Stars!!
Rori H.
1713379119
Thanks to all of the workers: Frank, Pascal, Jonathon, Ramiro, Jose Rivera, and Alessandro, that assisted in the new A/C, combustion vent addition, and small ventilation repair. On time, patient, and knowledgeable!
victoria F.
1713378557
Alessandro and jose rivera did a fantastic job! Thank you!
Jeff B.
1713378541
Louise G
1713312082
Superb service and very efficientAlex was an excellent technician…he was very knowledgeable and friendly and very helpfulUpdate 4/16: Kevin and Angel were wonderful, very helpful and knowledgeable. Will definitely ask for them again.
Estela N.
1713307133
Jose Rivera was helpful and fixed the issue with my new key pad and pump quickly and efficiently. He also made sure the remote access was working.
Maura L.
1713305706
Very knowledgeable and helpful!
Valencia M.
1713305546
Juan Molina was very thorough in his assessment of our heaters conditions. Was prompt and courteous.
Adam C.
1713305048
Great service from Michael I., Raul I., Jonathan A., Edwin C., Ramiro S. and Jesus F. -- excellent work done efficiently!
Israel
1713304719
RENÉ IS GREAT .
Cary T.
1713297820
Leo H and Tristen C were great!! Explained everything. Most important they did a terrific job!
Nancy H.
1713291151
Excellent work from both Stevens and David E. They did very thorough maintenance cleanup and before and after photos made it clear how necessary it is to do the twice yearly maintenance - will clearly keep system running at peak performance. Would recommend these two highly.
Bill B.
1713232027
Our technician Leonel was thorough in both accomplishing his goal of performing the seasonal tune-up on our system and updating my wife and me as to the overall health of our system. I found him to be competent, polite and trustworthy.
Egisia M El Basha H.
1713225482
Jose R.Pascul HGets on CRafa BPablo P. All excellent
Lauren K.
1713222854
Daniel B. went above and beyond fixing my air conditioning equipment today. He explained everything to me and made sure I knew exactly what he was doing throughout the process. My issue was tricky and he was able to figure it out and fix everything. Daniel is also incredibly kind and personable and made the process easy for me. I am completely satisfied with the service and will be contacting Daniel again for all my HVAC needs!
Mary H L.
1713221057
Ariel A. performed outstanding services! It was his first visit and he asked for an orientation which I thought was a very good approach. He wanted to make sure that he covered all the areas. We have been a customer of Brody Pennell for more than 30 years, and I can honestly say this young man is in the top 10% of the employees who have had the opportunity to service our home.
Margaret G.
1713219070
These guys are total pros. They know what they are doing and they explain everything clearly and the pricing is very transparent. Ivan and Jose C. are very friendly and efficient. I have just had a second very great experience with Armando. He came to maintain the heating system and was very thorough and efficient.4/15/2024: Ruben and Phil just came by to do maintenance on my ac system. They were so friendly and explained everything really well. They inspired total confidence. Another great Brody Pennell experience.
Rinzai-ji Zen C.
1713212152
We appreciate your recommendation of Ken. He demonstrated diligence and honesty throughout his time with us. I eagerly anticipate receiving the quote and reviewing its details. We look forward to the possibility of collaborating with Ken in the near future.
Andrea S.
1713210077
Jason, Hilton, And Leo were great. Polite and neat. All is well.
Michael C.
1713206188
Very professional and knowledgeable. We think the problem was solved due to high heat. Thank you
justin H.
1713205580
Armando and Benny were great. Highly recommend!
Mycroft
1713132842
Our old furnace was about at the end of its life. After discussion with our favorite technician Marco Ayala we decided to have a heat pump installed. A crew arrived this morning headed by Edwin Cabra. He was assisted by Diego B, S. Ramiro, Edgar H, Jonathan A. This team was well trained, worked well together and was finished this afternoon! Great job by all. That's why we have been customers for more than 15 years!!Update: there was a small issue with one of the wires. Ruben Medina found the issue and corrected it. Again Brody Pennell to the rescue! Thank you again!!Further update. Giovanny Quinterro found that the outlet being used had no power. He changed the outlet and we're back to having heat. Yay! Thank you once again!!
Daniel D.
1713054294
Diego B., Sergio S., Alberto H,. And Alex S. installed a brand new system in one of my units and replaced the piping. They took a job that's usually 2 days and did it in 6 hours. They were unobtrusive to the tenants, thorough, and genuinely nice guys. Works perfectly. Extra kudos to the guys for being cool with a couple of very friendly dogs that like to jump and lick. 10/10 would recommend.
Therese B.
1712963432
I just had David Mares here to service the A/C system that they installed 2 years ago. David was great at explaining all the pertinent information about the function and cleaning of my A/C / heating system. He took pictures to show me whatever potential issues there may be down the road. I would highly recommend Brody Pennell for the A/C / heating system and specifically David Mares as a technician.
Dominique Z.
1712961408
Juan Molina was wonderful and so helpful
Baden S.
1712961375
Ruben and Leo M were so great. So professional. So friendly. Great to work with
Jeff T.
1712961025
We just bought a complete HVAC system from Marcus at Brody Pennell and I've never felt better about a manager or a company, and I'm an exacting retired general contractor. Clear choices with zero pressure or upsellng, and character as solid as their well respected company, with the resources to back it up. Marcus was impressive with his expertise, and genuine honesty well beyond that of a company representative, as the kind of person you'd look for in a friend, who seems every bit as stable as this well established company. A real pleasure!
Nancy T.
1712960484
Kevin and David provided amazing customer service for our home in Beverly Hills. They were detailed, thorough, and did not try to rush through our appointment. I received text messages from David throughout their 3 hour visit with photos of the condition of our HVAC, areas of concern, and proof of filter changes! You really can't ask for more. These guys are the best and I would highly recommend them to anyone who needs HVAC maintenance/cleaning.
Nili H.
1712957739
Juan Romo was my technician. He was on time, thoughtful, clean and thorough. He was also very knowledgeable and answered my questions in detail. He took his time and didn’t rush. I’m always delighted with Brody Pennel’s service and recommend them highly. Today I had another service called by Ivan and Hilton And they were wonderful. Gave me a beautiful service and cleaned up as they went and tried to sell me a new filter which I’m for air purification
Joel S.
1712954903
Excellent service from Daniel and Maurice.
Kimberly A.
1712954768
Anthony Manzo was a very thorough and efficient technician. He was very helpful and I would highly recommend him .
Eric B.
1712952256
Once again, excellent service from Brody Pennell. David M. was great—helpful, friendly, and informative.
reyna C.
1712945385
Iván & Hilton were great !
Mike
1712944410
I signed up for a Brody Pennell service plan after they fixed my AC issue last year. I was very impressed with the easy scheduling and responsiveness from the team. Leo H. And Freddy came out today to do my annual AC maintenance, and they did another great job. I highly recommend working with this company!
Donna G.
1712884929
Very courteous, very professional and very thorough and clear in explaining all details.
william C.
1712878629
David Mares and Fabio Gomez were outstanding. Very detail oriented.
Angela B.
1712878029
Ariel A did my semiannual maintenance today. I was very pleased with how thorough he was throughout the process. He addressed Al, of my concerns.
samantha V.
1712873936
Last week we had Brody Pennell come and replace our heating system, I am glad that they sent an amazing crew. Rafael B, Rosendo V, Alessandro A, Nicolas and Jose Manuel. Very happy with the Company and their workers.
john D.
1712868398
My furnace would not start this am. I called for service at 9 am and Jose Rivera and Paul Pacheco arrived a few hours later. They diagnosed the problem as a flaky thermostat unit and replaced it. All if well now. Definitely 5 stars.
m T.
1712866112
Anthony Manzo any David Mares were great - a pleasure to work with. Knowledgeable professionals and nice guys. They did great work and we will request them for our next service.
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