Why Is Your Home’s Temperature Fluctuating So Noticeably?

Change adds spice to life, but fluctuating temperatures inside your home don’t. Maintaining uniform temperature control is a basic function of your HVAC system. Fluctuating temperatures may be a sign of dysfunction in the system or in the house itself. Excessively frequent on/off HVAC cycles also waste energy and impose excess wear and tear on system components. Here are some possible reasons for fluctuating temperatures inside your home:

Closed or obstructed room vents.

To maintain continuous uniform temperatures throughout the house, the HVAC system is designed for all vents to remain open at all times. Closing vents in individual rooms disrupts conditioned airflow to parts of the home and may be the cause of fluctuating temperatures. Make sure all supply and return vents are open at all times.

Air leakage.

If warm or cool air generated by your HVAC system rapidly escapes from the home, indoor temperatures will swing back and forth. Air leakage typically occurs around doors and windows, ceiling-light fixtures and other openings that allow indoor air to escape to the outdoors. Accurate testing performed by a qualified HVAC contractor can provide a reliable figure of home-air leakage as well as identify sources of leaks to restore more stable indoor temperatures.

Thermostat location.

If the system thermostat is located close to an HVAC supply vent discharging heated or cooled air, or some other heat source like a warm kitchen — or even direct sunlight — this may cause the thermostat sensor to turn the system on and off more frequently, resulting in fluctuating temperatures throughout the house.

Improperly sized components.

For consistent temperature control, both the AC and furnace must be appropriately sized for the house. HVAC “sizing” means accurately matching system BTU capacity with the particular square footage and thermal characteristics of the house. Both undersized and oversized air conditioners and furnaces may run erratically, causing fluctuating indoor temperatures. A sizing calculation performed by a qualified HVAC contractor can determine if system units are properly sized.

To minimize fluctuating temperatures and restore indoor comfort control, reach out to Paitson Bros., your Wabash Valley source of experienced HVAC advice since 1922.

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