What's Wrong With My Furnace? - On the House

What’s Wrong With My Furnace?

By on November 1, 2015
Furnace Maintenance

Question: My 1,200 sq. foot home used to be heated by a furnace from 1949 that ran at 25,000 BTU. Recently I changed the system to a newer, 7,000 BTU system. I thought this newer heater would be more efficient, but I find that it takes much longer to heat the house than the older system did. Is there something wrong with my furnace or do I need one that has a higher BTU? (Edward)

Answer: It’s a good idea to replace old heating systems with newer, more efficient models. These new models can work just as well or better than old systems, but they do work differently. Where old furnaces could be turned on and heat the house within a matter of minutes, new heating systems can take longer. If you want your home to be warm at a certain time, set the heat to go on about 45 minutes prior to that. Another important factor is whether your home is “weather-tight.” Make sure all doors and windows are properly sealed. If not, you may be losing heat at the same rate your heating system is producing it. By the way, check with a heating contractor who can tell you whether the new unit is sized correctly for your home.

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