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AC_Hacker · 04-22-12, 12:54 AM

You guys are forgetting minimum oxygen levels and at the same time, maximum CO2 levels... this is what brings on the 'stuffiness' sensation. In fact, I have seen technical specifications on commercial ventilating systems that have CO2 sensors that control the duty cycle of the air-exchange systems.

I don't think that there would be that much heat that would be lost in .35 ACH, (in your case 67,000 cu ft), especially when you consider that 5 to 7 ACH was considered acceptable a few years ago, which would be 7 to 20 times as much heat lost.

My house is approaching the stuffiness level. I had to work pretty hard to get there, too. I'm looking for, or will build a small .35 ACH high efficiency HRV, myself. I'm figuring that if I have a crowd of people in the house who are active or dancing, I can open windows to make up the difference.

-AC

04-22-12, 12:54 AM	#5
AC_Hacker Supreme EcoRenovator Join Date: Mar 2009 Location: Portland, OR Posts: 4,004 Thanks: 303 Thanked 723 Times in 534 Posts	You guys are forgetting minimum oxygen levels and at the same time, maximum CO2 levels... this is what brings on the 'stuffiness' sensation. In fact, I have seen technical specifications on commercial ventilating systems that have CO2 sensors that control the duty cycle of the air-exchange systems. I don't think that there would be that much heat that would be lost in .35 ACH, (in your case 67,000 cu ft), especially when you consider that 5 to 7 ACH was considered acceptable a few years ago, which would be 7 to 20 times as much heat lost. My house is approaching the stuffiness level. I had to work pretty hard to get there, too. I'm looking for, or will build a small .35 ACH high efficiency HRV, myself. I'm figuring that if I have a crowd of people in the house who are active or dancing, I can open windows to make up the difference. -AC __________________ I'm not an HVAC technician. In fact, I'm barely even a hacker...