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A Furnace Working As Intended
During a thermal infrared inspection today, among other things I was there to investigate, I thought this would be an interesting picture.
This is a thermal image of a high efficiency condensing gas furnace.  It is the one you have seen with PVC tubing exiting the unit.  They are terrific furnaces.  The one pictured here is 6 years old, which makes it the fourth generation.  This later generation has worked out all the kinks.  They work great.
Many gas furnaces, like my own, have flues which exit through the roof.  My furnace loses a lot of its heat through that flue.  Of the heat remaining to send through my house, I am gaining only a portion of that.  Therefore, a small portion of the dollar I am spending for natural gas is actually converted into heat for my house.  My furnace is "85% efficient," but that does not mean I am getting $.85 worth of heat for every dollar I spend on gas.
This unit eliminates the need for the flue that exhausts through the roof because it captures and re-burns that exhaust!  So for every dollar spent on natural gas, it is getting nearly a dollar's worth of heat. And ... more

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