Do You Need Two A/C Units for a Two-Story Home?






Reduce Upstairs Heat Gain


A lower cooling load in upstairs living spaces allows more moderate A/C thermostat settings and avoids over-cooling downstairs rooms. During the summer, heat energy accumulating in the attic can raise temperatures up to 150 degrees Fahrenheit. This acute heat conducts through the ceiling into upstairs rooms, offsetting the effect of air conditioning and requiring lower thermostat settings than the rest of the house. Attic fans that exhaust heat and upgraded insulation in the attic floor can reduce attic heat accumulation and keep upstairs rooms cooler without lowering the thermostat.

Install A Zoning System


Zoning divides a single HVAC system into separate cooling zones controlled by independent thermostats. Motorized dampers in the ductwork respond to signals from a central controller to direct cool air to one zone in response to a dedicated thermostat, while simultaneously shutting down or decreasing airflow to another zone that doesn’t require as much cooling. Zone dampers open and close independently of one another. This enables a single air conditioner to maintain different temperatures in upstairs and downstairs zones.