Will a non programmable electronic thermostat make any difference in heating/cooling cost? Mom & Dad want one in his house because the lighted keypad will be easier for them to see. Someone is always home so there is no need to change the temperature setting. We were looking at some Honeywell models online and when dad seen that they were accurate to +/- 1 degree, he thinks his bill will go up in cost because the system will run too much to keep the more accurate temperature. He says the old thermostat is accurate to +/-3 degrees. He has two AC/Heat units outside, one for upstairs and one for down. Gas heat and electric AC with heat pumps. If an electronic thermostat is recommended, what non programmable model would be recommended. I'm thinking that if it is possible to change myself, I would go down to Home Depot and pick one up and swap them out for him.