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), or even an inefficient heater that is wasting energy and money with every heating bill.But how can I know if it’s time to replace my heating system?Stay warm and enjoy great savings on your utility bills with the EL180UH135E60D furnace.

Nest is now rolling out a 4.0.1 upgrade to its smart thermostat after last month’s faulty 4.0 firmware caused Wi-Fi and battery issues.

They go and take a look at your furnace and find its capacity.

They come back and tell you that you have a furnace rated for 60,000 British thermal unit, the amount of heat required to raise one pound of water (about a pint) one degree Fahrenheit in temperature—about the heat content of one wooden kitchen match.

One Btu is equivalent to 0.293 watt-hours or 1,055 joules. Widely-used measure of the fuel efficiency of a heating system that accounts for start-up, cool-down, and other operating losses that occur during real-life operation. Furnaces sold in the United States must have a minimum AFUE of 78%. (AFUE) Widely-used measure of the fuel efficiency of a heating system that accounts for start-up, cool-down, and other operating losses that occur during real-life operation. Furnaces sold in the United States must have a minimum AFUE of 78%. , essentially the percent efficiency over the whole heating season).

Then they show you the price of their high efficiency furnace, which is 95 AFUE.