that's good evening YouTube as you can see up here I've got my attic fans shut off so they're
not running today I haven't had them on for three days and let me show you the thermometer readings
and we can see how effective those fans really are and this is in response to a couple of viewers
wondering if PC fans can actually cool an attic and I wanted to show you the numbers and we can
actually see how they work let's cut over to the thermometer here good evening YouTube so this is
my wireless thermometer here current temperature this is outside is 78 Fahrenheit and this is the
temperature up in the attic I have a wireless thermometer up there and the highest I saw it
hit today was 104 it's starting to cool down now and I have my attic fans on today I've had
a few viewers of my attic fan video say that the little computer fans don't do anything and they're
incapable of moving any air and so forth so what I want to do is run an experiment I did this
several years ago when I first put them in I did the reverse I measured the temperature before I
put in the fans and then measured afterwards and I noticed about a 10 degree fahrenheit drop and then
I also put in some radiant foil insulation in the rafter bays and that again did about a 10 degree
drop I used to notice the temperature up there in the Attic would be above a hundred and thirty
usually 133 134 this is about the hottest time between 6 & 7 is when the out it gets hot so what
I want to do is I'm going to shut the fans off and I'll probably have to run it off for a couple of
days without the fans running this temperature will get higher during the day and then it won't
get as cool during the night and then the next day it gets that much hotter and so you get this
kind of upward sawtooth waveform it gets hotter doesn't cool off as much and then gets hotter
again I wanted to run this test and document this on video and good morning YouTube just to
follow up this is the next morning on the attic temperature so inside the house at 72 outside
is seventy about ten in the morning and that's about when the Sun hits the roof of the house
comes around the trees on the east side and if we look here the attic temperature is only dropped
to about 72 last night normally this will drop to maybe 68 to 70 with the fans on because I have the
thermostat on the fans set around 70 Fahrenheit so they'll keep running until the attic gets
down to about 70 and then if there's enough time the natural convective cooling in the attic will
bring it down a little lower yeah good evening YouTube so it's a but same time day later after
I turned the fans off the temperature outside hit 85 today he's cooled off a little bit here and if
we look up in the attic is 108 I saw 108 point 9 just maybe half an hour ago I was waiting to see
if it would go up in he from there but essentially it's 5 degrees hotter up in the attic today than
it was yesterday with the fans running and it was a couple degrees warmer this morning at the start
interesting to note today the Weather Service said the high here was 85 and yesterday it was 91 so
yesterday it was 6 degrees hotter outside but the Attic was 5 degrees cooler Jannik morning YouTube
just a quick look at the thermometer here so the house inside temp is 71 here and the attics over
seventy-three so it's about a degree warmer than it was yesterday at this time yeah good morning
YouTube so this is a third day of running this test and you can see the temperature inside the
house is a little warmer probably because the attic didn't cool off as much overnight this is
the attic temperature it's now over 75 degrees and it had been 72 couple of days ago so you can see
it just steadily gains a degree or two a day in the morning okay here's the thermometer here so
this reading here is the temperature inside the house and it's actually several degrees warmer
than it was last Saturday today's Tuesday and on Saturday it was the same outside temperature it
hit 91 here's the outside temperature it's cooled off to about 87 now there's the attic I think it
hit about a hundred and twelve today but it was 91 outside today it was 91 outside on Saturday
three days ago and we were running about 104 on Saturday and about a hundred and twelve today so
you can see without the fans running that's about eight degrees warmer and you can see you get this
kind of upward trend in the temperatures and if I let this go probably for about a week this
temperature here would be up around a hundred and twenty that's the temperatures I was observing in
the Attic before I put the fans in but I think I am done with this test I've at least convinced
myself that the fans are still doing something you know they're keeping this temperature down
and you might think seven or eight degrees isn't that big a deal but I can really feel
the house is much less comfortable today than it was Saturday yeah good evening YouTube just wanted
to give you one further demonstration I turned the attic fans on about one hour ago and I've
already dropped the attic temperature almost five degrees probably four and a half degrees since I
turned the fans on yeah good evening YouTube are up on the roof of my house this is one of
the attic vents here I don't know if you can see that little piece of spiderweb right there
blowing in the breeze and if we use my heat gun here you can see I'm getting 90-93 stretch over
this I think I saw about 35 see on the hottest ya right there if you get up inside yeah 30 35
34 right there definitely hot air coming out of those vents and I can feel it you can see the
see that blowing on my finger there the whole attic temperature has dropped five degrees in
one hour so I think those fans works just wanted to give you some visible proof there so I think a
thumbs up for those fans they do the job so it was hot and sunny today the Sun shines on the
panel's goes down to my charge controller into the batteries and then it runs the fans that are right
down below there there's the two fans blowing air up and out the stack and there's total of
eight fans I think they do the jobs yeah hopefully that answers everybody's questions this is now a
fourth summer they they're going into operation or that they've been operating no problems yet
and they've been zero cost zero maintenance aside from brushing the dust off once a year or
so that's about the only maintenance I do anyway I hope that answers everybody's questions and if
you have any others post up in the comment section down below there and as always thanks for watching