I replaced the old Honeywell dial t-stat with the most expensive Honeywell I could find at Home Depot as suggested in a previous post. The heat will come on for 15 minutes off for 10 minutes repeatedly. Same with the cooling. Plenty of insulation and I can't imagine the ancient units are oversized. Do I trash the t-stat and call my heat and air guy to see if we have a larger problem or buy the Vision which I can set to so many cycles per hour?