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@d1incharge

Seems to work for all the BTUs stored up in your auto radiator.

isnt the point of the attic fan to get the hot air out of the attic after the sun goes down.
that way, your AC does not continue to run as the radiant heat in the attic goes back into your top level.

@AshburnSlumLord For some reason my roof isn’t aluminum finned and doesnt have a fan that is as big as it is. . So when your car runs at 120-140+ degrees you consider that cool? And a 3000sqft black roof in the sun creates how many more btu’s than your 1 liter hundai that coincidentally has a fan rated for more cfm…….LOL figure that one our? That fan my take a 10×10 area of roof from 152 to 148, attic vents are not for heat people.

@pleasantonnow Building Performance Analyst #CAN06347 My neighbor this my neighbor that. Air temperature is conduction, a vast majority of the heat coming through your ceiling is radiation which your attic fans do jack shit for buddy. They move more air through a loose fill insulation lowering it’s resistive value. I can calculate your savings and then calculate your costs after your third replacement fan in 10 years to prove your an idiot, but hey, you and your neighbor know whats best. LOL.

@pleasantonnow I lowered my attic temp by 35 degrees, never toughed the ventilation, and the what I did it with will last longer than the home. When I plugged the test numbers into my cost return calculator (Remdesign) I found that it will pay itself off in just a few years in savings, and it was off, it was only two years. But I am sure your attic fans kick ass. Half or more of the heat your a/c fights that floats up in two story homes, is created within the home.

@pleasantonnow You should try buying a thermal camera and measuring the temperature of the top of your insulation. I have had customers that had broken 1000+cfm fans, and when they replaced them the attic temp did drop a bit, but the top of the insulation didnt really change because of RADIATION. I can send you thermal pictures of the temperature effect fans make on surfaces like your roof and insulation in attics…..sorry the lack thereof. Many people fool themselves into justifying purchases.

@pleasantonnow I don’t keep track of products, I have about 5 customers a year tell me their solar fans only lasted 2-5 years. People with the wired type get 10-20 years out of theres. You can look up the research on the real lack of energy savings from any attic ventilation beyong required minimum passive ventilation. There are so many good places reduce btu load, or remove them more efficiently, even if any motorized attic fan worked, it should still be way way way down on the priority list

@dincharge . You have some agenda on this site. Its very apparent. All I can tell anyone who asks is what works. You, apparently, have had some bad experience. Anyone else who wants to know how the Solar Fans are working for me and my neighbor, give me a shout. By the way, 2 other neighbors are installing them so I guess like dincharge says…” we dont know jack shit” I beg to differ with that. We’re a pretty successful/educated bunch here.

@pleasantonnow Yeah, you are proud of spending money with an in-ability to save it back before the fan dies, good job. My dad sells 25 new homes a year and most customers will tell him how good their bills are. I have about 300 customers/year and part of what I do is install attic ventilation if it is needed. The companies best at saving customers money that I run into (HVAC, Energy Auditors) all agree solar attic fans are a joke, maybe you can convince these licensed professionals otherwise.

@pleasantonnow Sad, even your roofer who could have easily profited by selling you solar attic fans recommended against them, yet you still think you can outsmart them. Take this advice, keep that roofer. Isn’t that enough to convince you? What would make sense of a smart businessman to turn down easy money, contractors get those things half off or more of what you can, and can install them while they are there…….why?hmmmmmmmmm I am sure your fans work real well against the wind by the way

@pleasantonnow Wouldnt you have an agenda against them after say? I don’t know, 20 customers tell you theirs broke and are concerned with replacing it? And mention that their highest e-bill happened to come after they installed it so it must not have really done much to pay back the hundreds it costs. I was chapped at 20, now I am just fed up with people selling these peices of shit, you just wait. I was taught in class, out of a book why they don’t work, then I saw it in real life.

Passive ventilation has a CFM rating. That is how much air they move. For much less money, you can install the same CFM of ventilation and never have to worry about the failure of a moving part. Common sense alert: 99.99999% of new homes use passive ventilation.

@tripjet999 <– +1 for this guy, brand new house but badly built.(talking about the video)

OK, I’m not a contractor, but isn’t there supposed to be tar paper or something under those roof tiles? And why didn’t This Old House guy tell him? Why was this house used as an example?

I dunno, I think I ‘ll just use good old fashioned roof vents that I have. I’d rather add another of those than install all this new junk that lasts a few years.There is a reason my solid, 1926 bungalow is still standing!

That’s exactly how my attic looks ….no insulation what so ever haha.

@d1incharge I just installed my 25-year 30-watt attic fan, dropped my attic 30 degrees..I don’t know why you are so convinced they don’t work….I have a pyramid shaped hip roof with only 2 ft of ridge…this solar attic fan works great and i didn’t have to run any electrical..and i get to write off 30% of the fan and install on my taxes..

@pleasantonnow I am very happy with my 30 watt solar fan as well, dropped my attic temp 30 degrees..

It’s not that they don’t work, they dont work long. How many times are you going to replace your fan through your warranty before you get sick of it?There is an amount of passive ventilation that will easily outperform your solar fan and have zero moving parts. Who do you think pays for the 30% in the end? We all do. I am a licensed and have a thermal camera and have seen a few attics with many types of ventilation, roof sheathing radiats heat onto the ceiling, far more important than air temp.

@d1incharge I don’t understand why people insist that a solar attic fan is only good when in sunlight. Just like you mentioned, passive ventilation does work well. When the solar fan isn’t running it still acts as a passive vent with net free inches of air..Whether the solar panel moves 1500 cfm or 300 cfm…it is all in addition to whatever it would remove as a passive vent…Mine has a 19 inch opening which is much larger than standard box vents and I only have to put 1 hole in my roof.

“If you drive around an area where there is new construction look up at the roofers. If they are putting down asphalt shingles there is a good chance that they are not using roofing felt, commonly called tar paper. There are a couple of reasons for this. One is that the manufacturers claim that it is not needed. And the second reason is that it slows down the roofing crews.”

CFM on passive ventilation. Ok . When there is no wind, let’s see how much CFM your passive system is creating. Zero. I have neighbors that have paid a fortune for these “ridge vent systems” that roofers are pushing. Guess what. Does squat. I stand by my Solar Star Attic fan. It did a great job getting us through this summer. My neighbors did the same & love it, so while this “dincharge” character thinks we wasted our money, let him think that. Not my problem.

I love his other comment. 99.999999999% of new homes are using passive systems. Yeah pal, and guess what, they are HOTTTTTTTTTTTTTTT! Common sense alert indeed!

@tripjet999 I had the same thought exactly. 

Yes;
I hate it when the “pro” Tom Silva, assumes that the audience is comprised of people that do not have a clue. Clearly Tom does not know as much about proper attic venting as he should.