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TDTOM
Member since Jan 2021
5977 posts
 Online 

AC/Heater question

I have two units in my house. One unit is on the side where three of our bedrooms are. I have noticed that when I close my bedroom door there is a dramatic temp change from my bedroom to the hall. As soon as you open the door you can feel it. For example, early this morning (5:00) my clock said it was 58.5* in my bedroom. The heater was set on 72*. I went open the door and within an hour my clock was measuring 69*. There is air coming out of the vent in my bedroom as I checked it with my infrared thermometer. Any ideas what could be causing this? Thanks.


ItzMe1972
Member since Dec 2013
7100 posts
 Online 

I leave my master bedroom door open a few inches, otherwise; it affects the thermostat in the hall by a couple of degrees.

Some may suggest that I need an opening under the door, but there is already a one inch gap there.


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keakar
Member since Jan 2017
20658 posts

quote:

I have two units in my house. One unit is on the side where three of our bedrooms are. I have noticed that when I close my bedroom door there is a dramatic temp change from my bedroom to the hall. As soon as you open the door you can feel it.


this happens a lot, most likely your doors were not undercut by the contractor who built your home. every interior door in your house should have a clear 1 1/4" opening between it and the floor surface to allow proper air flow. if the air cant get out of the room then new air cant get into the room so you arre effectively shutting off that rooms ceiling vent when the door is closed


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notsince98
Missouri Fan
KC, MO
Member since Oct 2012
15327 posts

ask your HVAC guy what return air improvements they can make. If you can't do it via door cutting then a jumper duct might work well.

one thing i'd do to verify is get a mild smoke source or super light paper and verify that when the door is open just a crack that the air is flowing out of the bedroom. If that is the case then it is most likely lack of return air for your bedroom. If the smoke or paper is getting blown back into the bedroom with the door cracked then you have a lack of supply issue.


TDTOM
Member since Jan 2021
5977 posts
 Online 

Thanks.I know that if I have a small crack in the door it will shut when the unit kicks on.


notsince98
Missouri Fan
KC, MO
Member since Oct 2012
15327 posts

quote:

Thanks.I know that if I have a small crack in the door it will shut when the unit kicks on.


Sounds like insufficient return in the room. Cutting the bottom of the door or a jumper duct from your room out to the hall might work.


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CrawDude
LSU Fan
Baton Rouge
Member since Apr 2019
3914 posts
 Online 

Below are links to a couple articles from the Energy Vanguard blog discussing the importance of providing a pathway for return air from closed rooms in the home to the HVAC air handler - both articles discussing options recommended by other posters.

An Easy Retrofit for Return Air from Bedrooms

Can Door Undercuts Work as Return Air Pathways?






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captainahab
Nicholls St. Fan
Highway Trio8
Member since Dec 2014
1513 posts

You may also want to consider a thermostat with a secondary/remote temperature sensor. There are several brands available.

Here is the description from the Honeywell T9.

Place sensors where you want to see each room's temperature and humidity. Use the multi-room display on the thermostat's touchscreen — or in the Honeywell Home app — to focus on rooms based on occupancy or a specific schedule you choose. When focusing on multiple rooms, the T9 works toward creating an average temperature, balancing the needs across the whole home.


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