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Re: how long to raise heat 8 degrees with forced hot air?


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Posted by HeatPro on January 20, 2007 at 10:10:36:

In Reply to: how long to raise heat 8 degrees with forced hot air? posted by Rebecca on January 20, 2007 at 09:07:07:

When a new hi-efficiency furnace is installed, it is usually installed closer to the actual heat loss of the house so it IS more efficient. Older furnaces were installed very often TWICE as much input as needed, so it indeed heated faster and went on and off more often wasting energy, causing noise and blowing discomfort. Thus, with a properly sized unit, changing temperatures does take longer.

The only advantages of warm air heat are that it is cheaper to install, when installed cheaply with inadequate insulation and that it can have air conditioning attached.

The installer seems to have set up the new system correctly; but it is hard to explain to customers that putting in furnaces twice as large as needed, just 'in case' and 'to have better than the Jones's' isn't correct, so stayed mum with a story. Now that you have a 90+ efficient furnace, just keep it closer to the temperature you want to live in instead of making the house cold and hot, and you will save a lot more than it cost before.


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