How 21.5x26x1 MERV 8 Filters Affect Air Conditioning Efficiency
A delta T reading of 9 degrees is a problem. Our technicians measure the temperature difference across the evaporator coil on every tune-up call, and a healthy system should land between 16 and 22 degrees Fahrenheit. When it drops below 10, we go straight to the filter slot. Most of the time, there is a … Read more