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Why Rooms Are Still Hot When the AC Is Running

heat-waveThe modern central air conditioning system is designed to send cool air evenly around a house. If the ductwork in a house was properly installed and the right air conditioning system is hooked up to it, all the rooms in the house should enjoy similar levels of comfort.

It’s not always perfect, however. This summer, you may start to notice some rooms are warmer than you expect when the air conditioner is on. There are a few possible reasons for this uneven heating, and we’re going to look into a few of the more common ones. If the uneven heating persists and you can’t find a simple source for it, reach out to our AC repair experts. We offer 24-hour emergency service for your convenience.

Blocked or shut vents

One of the first things to check in a room that isn’t cooling down properly is if the room’s vent is open and clear of obstructions. It’s important to have all room vents open and unblocked—it not only ensures the proper distribution of cool air, it also prevents a spike in air pressure in the HVAC system that will cut into efficiency.

Trouble with a zone control system

Does your house have zone controls that allow you to change the temperatures in different places without affecting the rest of the house? If so, then one of the first things to consider when rooms aren’t the right temperature is that one of the local thermostats is malfunctioning or the central thermostat isn’t communicating with it. There might also be a stuck damper in the ducts.

Problems with the air handler

The air handler is the part of the HVAC system that draws in air through the return ducts and then sends the air into the AC and on into the ductwork. If the blower fan motor starts to fail, less air will be pushed into the ducts, and the most distant rooms won’t get enough cooling.


This is a phenomenon where the air conditioner’s compressor starts up to begin the cooling cycle, then shuts off earlier than it should. It will soon restart and then stop again. This constant stuttering puts immense strain on components and wastes power. It also won’t allow the AC enough time to cool all the rooms. Short-cycling can have a number of causes, and it’s best to let an HVAC technician diagnose what’s wrong.

Air leaks in the ducts

Duct material can wear down and develop holes and gaps, leading to cool air escaping into the attic or between walls—and not getting to its destination. The rooms connected to these leaky ducts will see a drop in cooling power. Duct leaks are the source of many problems in an HVAC system and must be repaired by expert technicians.

You can always trust to us as your Salt Lake City, UT, air conditioning experts. When you’ve got problems with cooling your house this summer, we’ll be there on time to find out what’s wrong and fix it.

One Hour Heating & Air Conditioning: “Always on Time … Or You Don’t Pay a Dime!” Call us for AC repairs any time of the day or night.

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