efficient furnace vs insulating

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

  1. zentantos

    zentantos New Member

    Messages:
    1
    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

    Messages:
    1,459
    Location:
    MD
    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
    http://www1.eere.energy.gov/consumer...nsulation.html
    The law of diminishing returns says don't add more than this.
  3. leejosepho

    leejosepho DIY scratch-pad engineer

  4. nhmaster

    nhmaster Master Plumber

    Messages:
    3,189
    Location:
    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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