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  1. #1
    Join Date
    Jun 2007
    Location
    North Carolina
    Posts
    1

    Question modulating furnace suitable in NC?

    Hi,
    Just wondering what the pros here thought about the suitability and/or benefits of a modulating furnace in the Raleigh/Durham area of NC?
    Thanks!

  2. #2
    Join Date
    Jul 2004
    Location
    Massachusetts
    Posts
    6,826
    My daughter was a Comfort Advisor for us for several years before she and her family moved back to NC. The first thing she did was replace the heat packs with two gas furnaces, 2-stage, variable speed blowers. Any 1-stage furnace should be sized for the coldest day of the year. Anytime the T-stat calls for heat, as far as the furnace knows, it is the coldest day of the year and so it procedes to fire up to maximum Btu output and that's what's delivered to your rooms. Average run time, 5-minutes or less when it's 55-degrees outdoors. Take that same day and a 2-stage furnace will likely run 10-minutes. That = greater comfort. 2-stage furnaces are all about comfort. The colder it gets outdoors, the longer the 1st stage cycle (unless it's set up to run solely on run time, which means it will always kick to 2nd stage after about 10-minutes of run time) becomes until it's running continuously. Then it begins to cycle 2nd stage and at design temperature (that's the coldest day we started with) it's on full time too. It's all about comfort. If you want the comfort, guy a 2-stage. There is NO money to be saved by going 2-stage. It's all about comfort.

  3. #3
    Join Date
    Apr 2007
    Location
    Rossland, B.C.
    Posts
    95
    A modulating furnace adjusts heat and air flow output continuouslywhile furnace is running. It is an excellent way to provide even heat through out your house. A modulating furnace should have a variable speed fan motor. This option provides additional energy savings over a multi speed furnace motor because it uses less electricity. A mod will provide better comfort because it can heat at aprox. 40% of full output. Most two speed furnaces start at low speed at 60% of high speed output. A better furnace will not make up for a poorly designed duct system. The duct design and thequality of your contractor are probably more important than having the best furnace made. Hope this helps.

  4. #4
    Join Date
    Nov 2000
    Location
    Eastern PA
    Posts
    68,852
    Quote Originally Posted by fire View Post
    A modulating furnace adjusts heat and air flow output continuouslywhile furnace is running. It is an excellent way to provide even heat through out your house. A modulating furnace should have a variable speed fan motor. This option provides additional energy savings over a multi speed furnace motor because it uses less electricity. A mod will provide better comfort because it can heat at aprox. 40% of full output. Most two speed furnaces start at low speed at 60% of high speed output. A better furnace will not make up for a poorly designed duct system. The duct design and thequality of your contractor are probably more important than having the best furnace made. Hope this helps.
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