efficient furnace vs insulating

Discussion in 'HVAC Heating & Cooling' started by zentantos, Nov 17, 2008.

  1. zentantos

    zentantos New Member

    Nov 17, 2008
    Can't afford to do both at the same time, so am hoping for advice on which to do first.
    I have a newly purchased 100+ year old house with no insulation and a 50 year old furnace.
    What would reduce home heating costs more: a new, efficient furnace or insulating?
  2. Thatguy

    Thatguy Homeowner

    Aug 27, 2008
    A bounty hunter like in "Raising Arizona"
    A 100% efficient furnace will still lose heat through too little insulation.
    You'd be paying to heat the air outside and around your house.

    With perfect insulation, the heat given off by your appliances and the people in your house (about 100w per person) could heat your house, if you never opened windows or doors and had no infiltration losses.

    Here's how much insulation you should have
    The law of diminishing returns says don't add more than this.
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  4. leejosepho

    leejosepho DIY scratch-pad engineer

    Nov 23, 2006
    disabled-retired industrial fabricator
    200 miles south of Little Rock
  5. nhmaster

    nhmaster Master Plumber

    Jul 30, 2008
    Tech. Instructor
    S. Maine
    Inasulation is always the first step. As old as the heating system is changing it now will not have near as much effect as insulating would. I had a similar situation a few years back with a 200 year old house. I did the really smart thing and sold it. :D
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