Hello,
For some reason this year my air conditioner is not producing enough cold air to cool the upstairs of my house. When I go to the ground floor there is enough cold air coming out, and it's nice and cold, but upstairs, it's too hot. I try to lower the thermostat to 70 degrees, and "cool" air comes out of the vents on the upstairs, but for some reason, the house is not cooling down enough to make the thermostat shut off. What's the most likely culprit?
Thanks Sam