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Geo NR Gee · 10-18-12, 01:08 PM

Since my home was built to a higher energy standard of the day (late 1990's), and supposedly tighter construction methods, they installed a fresh air duct to the heating system. When it comes on (via a timer), the high cfm bathroom fan in the upstairs bathroom begins. It was set for 10 minutes every three hours. I thought that was a bit excessive.

After I had a energy audit done with the blower door test and high tech thermal imaging device, I know that the house is not as tight and insulated as it could be.

With that in mind what should one expect with a heat exchanger? I found one with 50% efficency on a Mitsubishi unit for sale locally. The unit is only $45 but after reading this, maybe I should make my own?

10-18-12, 01:08 PM	#1
Geo NR Gee Journeyman EcoRenovator Join Date: Jan 2011 Location: Seattle Posts: 326 Thanks: 109 Thanked 23 Times in 18 Posts	Air to Air Heat Exchanger Expectations Since my home was built to a higher energy standard of the day (late 1990's), and supposedly tighter construction methods, they installed a fresh air duct to the heating system. When it comes on (via a timer), the high cfm bathroom fan in the upstairs bathroom begins. It was set for 10 minutes every three hours. I thought that was a bit excessive. After I had a energy audit done with the blower door test and high tech thermal imaging device, I know that the house is not as tight and insulated as it could be. With that in mind what should one expect with a heat exchanger? I found one with 50% efficency on a Mitsubishi unit for sale locally. The unit is only $45 but after reading this, maybe I should make my own?