You have set points for heat, set points for cool. Most people have day and night settings, maybe weekend settings.
Typical heat is about 68 to 70 when occupied, 62 to 65 at night or when not home. I have the heat come back up in the morning about 15 minutes before I get up.
Set the cool for 80 or whatever you choose for comfort.
Different brands have different procedures so check the manual for yours.
80 for cool and 70 for heat. You might want a two degree plus or minus if it has that option so that the furnace or AC doesn't cycle on and off too often.
Well, the furnace wants to heat if you're below a certain temperature and the AC wants to cool if you're above a certain temperature. In between those two extremes you don't want them fighting each other.
No. My themostat has a switch for either heat, off, or cool and cannot be set for both heat and cool at the same time. If your system *can* do that, having them set close enough to overlap could cause them to fight each other so having them both set to 90 (always overlap) would not be a good idea either.
There is usually some small range (+ or - 2) where, for instance, it will heat until it gets to 72 degrees and shut off - then when it gets to 68 degrees turn on again. If the AC does the same thing on the cooling side you could waste a lot of power and get no benefit if they're both set to the same temperature.
My comment was because you first stated 70 minimum and 80 maximum which seems a good comfort zone to me. 90, not so much.
Uhh, no, you didn't. You don't 'delete' usenet posts. You can issue a cancel command, but, it's been abused so much, most (nearly all) usenet servers no longer honour it.
What a loon. Forget about comfort, there was only 70 and 80 mentioned in the original post. So, where did 90 suddenly come from? And who typically has 90 as a set point? I smell a troll.
I found that mine (Honeywell touch screen, I don't know the model number now) had one, but it was hidden behind a setting you had to read the manual to find. AUTO selects either heat or cool as needed (separate setpoints). That's often appropriate here in late fall or early spring.
Set it to heat when you want the heat to work. Set it to cool when you want the AC to work. Some thermostats have an auto mode where it will switch between the two by itself, but I've never had the need for it personally. Set the fan on if you want the fan to turn on and run by itself, without heat or AC.
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