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Just an FYI, closing up vents in an hvac can actually cause problems. It puts more strain on the fan unit, which can cause it to burn up quicker. The unit is designed to move a certain amount of air, if you restrict that air, pressure builds up in the system.
A couple closed over an entire system is fine, but closing all but one room would definitely cause problems.
I have been closing 3 out of 5. Is that too much?
Depends on the unit and whether it was over sized or under sized for the space, but restricting 60℅ air flow is a lot.
Another thing to consider is that if you later want to heat up the entire house, the unit has to work harder. Sometimes it can be more efficient to just keep the house close to your target temp.
Thanks for your response! I appreciate it. Do you know how I can investigate this further? I would like to figure out if I'm over-stressing my unit because I've been doing that for the past ~2 years.
Heating up the house happens so rarely that I can't remember the last time I did that. It may have been ~2 years.
Wait until your furnace dies and see if it was closer to ten years or to 25 years?
Add up your maintenance costs over the life of the furnace and decide whether your actions could have saved enough money to change your behavior?
But seriously I’m not sure there is a clear provable answer until it happens, and even then ….
….. so for me, I tend to look at how expensive it would be to replace the furnace and decide to do everything I can to extend its life
I'm not an HVAC technician so I wouldn't know exactly, but I think there's two things to consider: static pressure and duty cycle. Static pressure is the fan working hard to spin which causes wear on bearings. Duty cycle is how long the machine runs. If your duty cycle is too low then the machine is turning on and off quickly which is bad.
You could look at the size of the unit and there's some rules of thumb that translate size, climate, and square footage of just the areas you leave the vent open and there are online calculators you can use.
I think the only way to know for sure is to measure the pressure drop across the intake and outflow and see what the fan motor is rated for.
This is a good starting point! Thank you very much
Another good way to do it is to actually hire a HVAC individual on and have them come out and just look at the system. But be wary of that. Some of them are not exactly the most brightest bulbs in the world. And they will tell you, oh you have to have them all open at the same time you can’t close them. Without actually looking at the system. I’ve run into that to myself. In my house, I can close, almost half of my vents without any issue, and yet a number of techs have told me I can’t do that. Until I make them go and look at the furnace and count the number of vents and look at the size the vents then they go oh yeah, I guess you can.
Like I said some of them are not very bright. So maybe it might pay to hire on a couple of them to really look it over. Make sure they really look at the central system, blower furnace, etc. and then also look at the vents in the size of the vents.
Yes, it cost some money upfront for them to come out and help you with it, but you can get an idea of to what they’re doing.
The other option is to go down to the library and check out a bunch of books on the subject and try to learn it yourself.