Hire the best Air conditioning and Heating Experts

Calculating running cost of gas and inverter heaters/coolers?

Results 1 to 5 of 5
  1. #1
    Senior Member
    Join Date
    May 2007
    Location
    Williamstown, Victoria
    Posts
    106

    Default Calculating running cost of gas and inverter heaters/coolers?

    Can someone give some guidance (or links) that show how to calculate the cost of running a gas ducted heating system or inverter (heat pump) heating/cooling systems.

    I'm trying to weigh-up the running cost of a gas/ICE (non inverter) system vs a inverter system. I have the specs showing output power (min and max), input power & efficiency for heating and cooling.

    The gas heating is cheaper to run; however the bolt on ICE (non inverter systems) are not as efficient as an inverter. Given I'll probably only use the AC for 10 days a year it probably isn't an issue. Just would like to determine running costs.

  2. #2
    Senior Member
    Join Date
    Dec 2007
    Location
    Brisbane
    Posts
    188

  3. #3
    Senior Member
    Join Date
    May 2007
    Location
    Williamstown, Victoria
    Posts
    106

    Default

    Brilliant thanks. need an equivalent for gas heaters now.

  4. #4
    1K Club Member
    Join Date
    Jul 2007
    Location
    Sydney-south
    Posts
    1,858

    Default

    Get the M/J rating off the appliance, divide it by the heating value per cubic metre of the specific gas you are using (NG/LPG) and work out off your bill how much a cub.metre of gas is and there you have it.
    eg 38mj p/h ~ 96mj = 0.395m/3

    and if for arguments sake gas cost 50c per m/3
    0.5x0.395=0.1975

    so it will cost you almost 20c p/h to run.
    Plumbers were around long before Jesus was a carpenter

  5. #5
    Senior Member
    Join Date
    Feb 2006
    Location
    Hicksville
    Posts
    177

    Default

    Quote Originally Posted by wonderplumb View Post
    Get the M/J rating off the appliance, divide it by the heating value per cubic metre of the specific gas you are using (NG/LPG) and work out off your bill how much a cub.metre of gas is and there you have it.
    eg 38mj p/h ~ 96mj = 0.395m/3

    and if for arguments sake gas cost 50c per m/3
    0.5x0.395=0.1975

    so it will cost you almost 20c p/h to run.
    assuming it is running all the time. That's an assumption that is fine if you are just comparing different forms of heating but not if you want the actual cost. The actual cost is relevant if you are working out the pay-back time of a more expensive but more efficient kind of heating.

    There is a free Choice magazine article here
    http://www.choice.com.au/viewArticle...eating+options

    We've got ducted reverse cycle air con as the only form of heating. I think if I had to replace it, I'd put in a gas ducted heater and a couple of split air con units (plus more insulation). I think R/C air con is more expensive to maintain/fix than a gas heater. We have ducts in the roof in this house and they are dust free unlike the under-floor ducts in the last place.

    According to Choice, gas is slightly more expensive to run than reverse cycle air con (for heating) in Melbourne. However gas produces much less CO2, only beaten by wood burning stove (assuming trees are replanted).

Similar Threads

  1. calculating shelf spaces
    By macklin in forum Kitchens
    Replies: 7
    Last Post: 29th Feb 2008, 06:52 PM
  2. Inverter Power supply
    By West OZ Mark in forum Electrical
    Replies: 11
    Last Post: 7th Dec 2007, 11:01 PM
  3. calculating skip requirement
    By gsouth in forum Landscaping, Gardening & Outdoors
    Replies: 7
    Last Post: 16th Dec 2005, 09:19 AM
  4. Help in calculating $$
    By Bodgy in forum Structural Renovation
    Replies: 5
    Last Post: 16th Nov 2005, 08:31 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •