A few years ago I looked onto our electricity consumption. Found we had an inline vent heater in our air make up unit. Our HVAC system is on for 20 min every 60 minutes and the air brought in from out side had this electric heater t warm up the outside air. It is a 220V electric heater which uses alot of electricity. Ours was set to heat the make up air to about 20C, I had the choice to turn it down or turn the breaker off, after talking to the manufacturer we turned it off. Made quite a difference.
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