AC won't shut off with HW IAQ VisionPro T-stat
i had an Amer. Stnd. 92.5% furnace with comfort-R put in over the winter and couldn't be happier with the furnace. now that we are in the cooling season, my t-stat is set at 74 and when the cooling reaches that set temp, my AC compressor will not shut off. it just keeps running, but interesting to note the temp inside the house remains a constant 74. the fan setting on the IAQ is for continuous 160 cfm and i have an aprilaire 5000 e/s filter (hooked to furnace board). question...why won't my AC compressor shut off? it is an older york 10-seer and is in good working order.