efficient furnace vs insulating

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

  1. zentantos

    zentantos New Member

    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

    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.
  3. leejosepho

    leejosepho DIY scratch-pad engineer

  4. nhmaster

    nhmaster Master Plumber

    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
Similar Threads: efficient furnace
Forum Title Date
HVAC Heating & Cooling Most efficient water temp settings on furnace Dec 1, 2007
HVAC Heating & Cooling Heat Pumps MORE Efficient to run that hot water loops ? Apr 21, 2010
HVAC Heating & Cooling Oil heat -- efficient temps... and electric heat in one room? Oct 7, 2008
HVAC Heating & Cooling Which A/C setting is more efficient? Jun 16, 2008
HVAC Heating & Cooling Furnace fan works on AUTO but not on ON Dec 7, 2014

Share This Page