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Old 10-01-2010, 11:52 PM   #1
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slow down furnace blower?

What are the effects on heating if I was to slow down my furnace blower? I had a hvac guy here a while back to diagnose a noise issue which turned out to be the blower vibrating due to too much pressure, as I recently changed the filter to a thicker, higher quality one. My option is to either get a cheaper filter that lets more crap through, or slow down the furnace. He offered to do it when I asked if I had a multi speed but said it might make the system cycle more often, so I said nevermind but thanks.

Now I'm thinking of maybe trying it anyway, is this something easy enough to do like just a switch somewhere on the board? Will it indeed have any negative effects? I can imagine air will be much hotter when it comes out, and not shoot as much, so maybe that could be a problem.


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Old 10-02-2010, 05:50 AM   #2
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You need to do a proper temp rise test thru the furnace and set the blower so the furnace is not running too cool or too hot which will cause a premature heat exchanger failure or other problems.

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Last edited by yuri; 10-02-2010 at 06:00 AM.
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Old 10-02-2010, 07:01 AM   #3
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Should have left him do it while he was there and able to check the temp rise.

As Yuri said. Too hot will harm your heat exchanger.

If you decide to do it yourself. Make sure you have a good thermometer that you can check the air temp entering the furnace, and leaving the furnace. Checking temp at the registers is accurate enough.

Depends on furnace, weather its a wire move/change, or dip switch settings.
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Old 10-02-2010, 04:45 PM   #4
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Yeah should have probably left him do it, not sure what I was thinking. What would be the proper temp change to look for?

I might go for the simplest alternative and just switch the filter though. At least I know it's running as intended by the manufacturer, just not using a filter that it likes.

And what do you need to buy to get a $1 Canadian tire bill? Must be something quite expensive LOL. Don't think I've ever seen one.
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