1. Should I have a new programmable thermostat installed with my new system?
It is not necessary to replace a new thermostat with a new system, but if you have an old style thermostat with a mercury bulb, then it is recommended that it is replaced with a new digital thermostat. This is because a mercury bulb is inaccurate and can be off by 3 to 5 degrees. A programmable thermostat can increase system efficiency and lower monthly utility bills if you follow energy conservation guidelines for heating and cooling.
2. Is it better to set the thermostat to a higher temperature (85° F and above) while at work all day and cool the house after coming home, or to keep the thermostat just a degree or two higher during the day so that the cooling unit doesn't have to work as hard during peak hours to cool the house?
It is better to set the thermostat one or two degree higher during the day. It is more efficient and less hardship on the cooling unit.
3. I want to replace our thermostat with a programmable one. Which do you recommend?
If you are the type who likes to set the thermostat once and forget about it, I would recommend you to get Honeywell T6 Pro thermostat. If you are the type who would like to have more control of the temperature whenever & wherever, then I would recommend replacing the thermostat with NEST or any WiFi thermostat.
4. My thermostat has 3 thermostat wires, but repair technician said that I need 5 thermostat wires, is it true?
Yes, it is true. For air conditioning and gas furnace system, it requires at least 5 thermostat wires. For heat pump system, it requires at least 7 thermostat wires.
5. There is a click sound from the thermostat, but nothing starts after the sound.
Your indoor unit may have no power, or the fuse is burnt out.
6. How do I replace a thermostat?
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