A question for H&A guys I couldn't answer today

[mr ed]

Somebody asked me today. when you turn your thermostat on your gas furnace from 70 and then to 75 does it burn hotter or just longer to reach 75?
I told them I just thought longer cause I thought it put out the same btu's all the time. But I'm not the sharpest tool in the shed.

 

[L.C.]

just longer to reach 75

 

[SoonerP226]

It just burns longer—the flame is already a lot hotter than the ambient temperature, so it doesn’t need to burn hotter.

 

[turkeyrun]

I have told my Wif thousands of times in our years together, "setting the thermostat to higher temp does NOT warm the car quicker."

Heat is heat. It takes time

 

[Gunbuffer]

Depends on your furnace.
There are single stage furnaces like many(most) have grown up with but there are 2stage furnaces these days where there are effectively a low and high. They’re definitely out there

 

[DDriller]

Ours is a two stage and definitely heats hotter and quicker.