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monongahela_gw

Is my furnace output temp unusually low?

Monongahela
9 years ago

My home has two zones, and zone 1 is heated by a Carrier model 58STA110, 110000 BTU, 80% efficient (AFUE) propane fueled furnace with a Temperature Rise of 30 - 60 degrees Fahrenheit. We keep the thermostat set at 69 degrees.

The design maximum out temperature of this furnace is 165 degrees. But when I test the in duct temperature just a few feet downstream of the heat exchanger, around the corner and into the main trunk, I get a maximum of 115.7F. At the registers I get as low as 96.3F (farthest from furnace) up to 109.6F (closest to furnace).

A contractor at my home yesterday suggested the way my ducts were set up, some of them should be hotter than a "scalded dog". When I told him the max register reading of 109F he looked surprised.

Now maybe he's just got a good game, because he was suggesting a dual fuel furnace to replace my current 11 year old furnace. I didn't bite, but his reaction did cause that question to form in my mind. Is the supply temperature from my furnace too low?

Thanks for your feedback.

This post was edited by Monongahela on Sat, Jan 17, 15 at 22:02

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