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The first step to diagnosing the problem is understanding the term ‘load’ in an HVAC context. Load refers to the amount of heating or cooling that is required to adjust the temperature in a space. Load calculation tests return accurate answers by evaluating the size of your living area, the number of appliances that you have in operation, and the height of your ceilings and windows. This information is pertinent to establishing the correct size for your air conditioner. Systems that are too small or too large won’t operate efficiently.

Bear in mind that an air conditioner removes humidity. However, if the system is too big, it still delivers cool air quickly but won’t have the time to properly remove humidity, resulting in warmer rooms. It makes sense to have a professional perform the load calculation and advise you on the best size of air conditioner for you.

According to building scientists, closing a door in your house can cause safety and comfort issues. Air conditioners can move between 1,000 and 2,000 cubic feet of air per minute. To put that into perspective, think of moving 1,000 to 2,000 14-inch balloons from one space to another. Closing a door blocks the path of cool air into a specific room. Consequently, you reduce airflow in the room and throughout the system.

Since the door is closed, you’re pressurizing the room, which forces the cool air out of the room through the tiniest opening possible. As air-conditioned air escapes, it must be replaced with air coming in from the outside. Depending on how many doors you close inside, the temperature can go up by 300 to 900 percent. For this reason, you should keep all doors inside your home open.


Other Factors That Influence Room Temperature

The air filter is one of the most critical components of your air conditioner. It traps dirt and debris to ensure that the air in your home is of superior quality. As it runs its course, your unit will circulate air filled with these contaminants. Similar to the air filter in your car, you must change it regularly: a dirty filter can create uneven temperature distribution.

If you’re living in an older home and you’re asking, “Why is one room in my house always hot?” you should consider that you may have inefficient windows that contribute to a warmer space. You can minimize the amount of ultraviolet light entering the home with double-sided, Low-E glass windows. If you don’t have the finances for this project, think about adding a window film or tint.

Poor airflow is a problem that can arise due to multiple factors. The primary reasons for this issue are ventilation and air ducts. Dust and debris are the main culprits that build up and block air from reaching certain parts of the house. If you discover that one room is particularly warm, inspect the vents to see if there is a blockage. Additionally, you should have a professional HVAC company inspect your ducts for leaks or clogs. Issues with the ductwork could be responsible for one room failing to cool down as the rest of the house does.

Insulation is a critical aspect of making your house comfortable. The improper distribution of heat results in wavering temperatures inside the home. You may assume that insulation only plays a role in keeping the interior warm, but it also assists with maintaining the temperature levels indoors. The absence of insulation in the ceilings, walls, and ducts will lead to a build-up of heat that is sure to impact your comfort levels.

The location of the thermostat is another point to consider. Even though you may set a particular temperature, the system doesn’t operate to reach the number that you set for the entire house— rather, it targets the area around the thermostat. For this reason, you should install the thermostat on an interior wall in a space where your family spends most of their time.


Considering Technology

Every household that has embraced technology includes computers, televisions, lights, and other electronics. Unfortunately, these items generate a fair amount of heat. If your air conditioner is operating efficiently and you’ve addressed other potential issues, then you should consider turning off some of your electronics. Additionally, appliances such as the stove, oven, and microwave can affect the temperature within the home. Try using them sparingly or when the ambient temperature cools down.


Still Need Help?

If these points don’t help you answer the question, “Why is one room in my house always hot?” then you should call in a reputable HVAC contractor