Why is one room in my house always hot? Common Causes & Fixes

Why is one room in my house always hot? Common Causes & Fixes

Why is one room in my house always hot? Common Causes & Fixes

Several different problems may cause this symptom. The most common reasons are incorrectly sized HVAC system, problems with your air ducts, insufficient insulation, and improper ductwork design.

Common AC Problems- Why is One Room Hotter than the Rest?

Clogged or Dirty Air Filter

Your filter needs to be changed at least every 90 days.  An overly dirty filter can restrict airflow to certain portions of your home. Checking the filter is one of the simplest things to inspect.  If you cannot remember the last time it was changed, go ahead and swap it out with a new one.  

Hot Air Is Leaking into a Part of Your Home

Older windows do not block heat as newer windows can.  Newer windows have a coating that allows them to reduce heat transfer.  Energy.gov states that 10-25% of your heating and cooling consumption derive from energy loss.  Window coverings or reflective tints can help reduce heat transfer.

Another common issue is heat absorption. If the walls of your room directly face east or west and the sun beams on that portion of your home all day, it can very easily absorb much of that heat.  This problem can be solved by shading that part of your home.

Insufficient Insulation

The room in your home which is consistently hot may have inadequate or uneven insulation.  Poor insulation can result in heating and cooling loss.  If you have an attic, you can check the attic space over that part of your home.  If you do not have attic access, consult with a professional to determine access points.  Your home should have insulation with an R-30 rating, according to Energy.gov if you live in Arizona.

Ducts without insulation

Your ductwork needs insulation to contain conditioned air.  It is possible that a portion of your ductwork is missing this insulation.  This could be difficult to inspect.  If you have access, inspect some of your ductwork or call a professional HVAC contractor to check for you.  If you do find your ducts with missing insulation, simply adding insulation to the ductwork can solve this problem.

Improper ductwork design

Improper ductwork design will result in inadequate cool air being delivered into this room. Unfortunately, this is not an easy problem to fix.  An alternative method of keeping this room cool can be achieved through the use of ductless HVAC systems.  

Would you like a cost effective way to bring air conditioning to a room in your home without installing ductwork?

Look into a Ductless AC system.

Ductless AC systems are an excellent way to bring affordable and low-maintenance cooling to any room of your home.  Particularly, garages, attics, additions, or anywhere else your existing system either doesn’t reach or doesn’t serve properly.

If you believe a ductless system may help you, check out this link here:

AC System Undersized for Home

If you have an older home and never had an issue with one room being hotter than the rest until recently, then this most likely isn’t your issue.  However, if you have a newer home, and you have always had a problem with one room being hotter than the rest, then this may be your issue.  An undersized HVAC system will be unable to cool your home equally efficiently.  The best way to determine this is by having an HVAC contractor out to perform an AC inspection.  

Conversely, your air conditioner may be too large. Some HVAC contractors believe a larger system allows the home to be cooled faster.  However, an oversized system will not evenly spread the air throughout your home.  There isn’t much you can do for an oversized or undersized HVAC system that is already installed in your home.  Unless you just had the system installed. If that is the case, immediately call your HVAC contractor to investigate further.

Air Ducts Have Lost Seal

Your ducts transfer air through and around your home.  If a connection becomes disconnected, you will lose airflow.  Where are your ducts located?  In the walls ceiling and attic.  Locating all your ductwork can be difficult.  Inspect what you can. If you are unable to determine duct locations, call your local HVAC contractor.  With the right equipment, they can test for loss of air-flow and pinpoint your issue.

Experience heating or cooling issues in portions of your home?  Get a professional diagnosis from R&R Refrigeration, Heating & Cooling.