I’m trying to wrap my head around the Resist curve and balance point, but I’m having some trouble. If no equipment is running, wouldn’t the temperature inside always end up being the temperature outside? If that’s the case, I would expect the balance point to be around my set point, but it’s quite a bit lower. Is this because of other sources of heat in the house (like humans, hot water, etc.) or due to solar radiation?
The resist “curve” will show you the point above or below which heating or cooling is required where it crosses the 0F line.
The heating balance point shows you where the heating system can no longer generate enough heat to overcome the loss of heat of the house. It should be considerably lower than your set point. It shows you the temp where additional heating is required.
Because of the insulating properties of the home, with solar radiation and the change in outdoor ambient temps etc., there will always be a temperature differential between inside & out.
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The resist “curve” will show you the point above or below which heating or cooling is required where it crosses the 0F line.
This is somewhat counterintuitive though, and I think I must be missing something. My resist curve intersects 0F at around 50F, which would imply that I should not need any heating when it’s 50F outside, which is really not true if I want to keep my home above 66F
On the other hand, it also implies that I should need cooling at any point above 50F, which is also not true, since I generally don’t need cooling until it’s at least 80F outside.
My bad on the use of that language. But, it was close. Lol. That 50F point is where the home neither gains or loses temp as compared to the outdoor ambient temp. It is the point that you mentioned earlier where the home will stay the same indoors as it is outdoors.