G W Posted May 15, 2015 Share Posted May 15, 2015 For this specific instance lets just say it's a current home that vents to the outside. Nobody is going to vent stale bad (humid) air into the attic, right? Ideals are peaceful - History is violent Of course, you're asking a question that can't accurately be answered. You stipulated all air is bad and humid. I don't have bad humid air in my house. Link to comment Share on other sites More sharing options...
xKing Posted May 15, 2015 Share Posted May 15, 2015 Teken, I though WHF vents directly into the attic space? I know venting bathroom exhaust fans into the attic space is a bad idea paulbates, my water heater is in the attic so that won't be a problem, thanks Link to comment Share on other sites More sharing options...
paulbates Posted May 16, 2015 Share Posted May 16, 2015 Thanks, for all your suggestions, guys My house is 2 story ~2600 sq/ft with 2 HVAC systems (upstairs and downstairs) so I'm still thinking/deciding. Ability to vent the house with the cool FRESH air would be great. Venstar has a generalized video on free cooling, though the control portion in geared around their colortouch thermostat. It turns it into a 2 stage cooling system. If parameters are met, it cools the house stage 1 via free cooling. If free cooling parameters are not met, or free cooling won't meet the call from thermostat, it kicks on the compressor as stage 2. Its probably worth letting a venstar thermostat control it. By monitoring stage one and stage 2 outputs through venlink on the ISY, you could log running minutes of stage 1 and stage 2 to know how much value you are getting, even rough estimate a savings. They set their free cooling threshold at 60 degrees, I would say probably higher than that here, at least 64 (there would be a couple of degree deadband and it has to meet a 2 degree difference in the house. This you would observe and configure) Now, I am thinking about this all over again! I'm having my AC units checked out for the season next week, I will ask again... Link to comment Share on other sites More sharing options...
G W Posted May 16, 2015 Share Posted May 16, 2015 Venstar has a generalized video on free cooling, though the control portion in geared around their colortouch thermostat. It turns it into a 2 stage cooling system. If parameters are met, it cools the house stage 1 via free cooling. If free cooling parameters are not met, or free cooling won't meet the call from thermostat, it kicks on the compressor as stage 2. Its probably worth letting a venstar thermostat control it. By monitoring stage one and stage 2 outputs through venlink on the ISY, you could log running minutes of stage 1 and stage 2 to know how much value you are getting, even rough estimate a savings. They set their free cooling threshold at 60 degrees, I would say probably higher than that here, at least 64 (there would be a couple of degree deadband and it has to meet a 2 degree difference in the house. This you would observe and configure) Now, I am thinking about this all over again! I'm having my AC units checked out for the season next week, I will ask again... This is great. Now I really want one. Link to comment Share on other sites More sharing options...
paulbates Posted May 16, 2015 Share Posted May 16, 2015 This is great. Now I really want one. So, if you mean a Venstar Colortouch, I have a fix for that..... Link to comment Share on other sites More sharing options...
G W Posted May 16, 2015 Share Posted May 16, 2015 So, if you mean a Venstar Colortouch, I have a fix for that..... Thank you for the offer. I want the 7900. Link to comment Share on other sites More sharing options...
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