Pull in garage with hot car!!!!

[Viperz06]

Live in FL and when I return from a trip and pull the car in the garage it heats the garage and the sealed attic above to well over 100 degrees and it stays hot forever baking all the stuff I have stored in the attic. I have thought about some kind of exhaust fan (like in the bathroom vent fan, but on steroids) vented outside. Has anyone conquered this problem?

 

[OzarkMan]

We have similar issues in AZ, but I have plans for a mini-split a/c unit. We had one in the last house which made the garage a perfect place to be year round.

 

[jd_1138]

Probably have to add some larger fans blowing the heat across the car over to the exhaust fan for that to work.

Could just let the car sit outside and use the garage as a workshop. Or just leave it outside til it cools off and then drive it in.

 

[KRB52]

Move to a cooler climate. There are the large fans ( 2 foot and up) that warehouses, industrial buildings, barns, etc. use. Either floor fan (leave the doors open for a while) or one that mounts in a wall (up near the ceiling.) By-the by, is there any ventilation in the attic that will let out some of the heat?

 

[Viperz06]

no ventilation. it is a sealed attic with isonene. I could route an exit fan in the sofet if need be.

 

[DC73]

I have thought about some kind of exhaust fan (like in the bathroom vent fan, but on steroids) vented outside.

I've thought about doing this to my garage and think an exhaust fan on a timer would help a lot. As you mentioned, exhaust it through the soffit. Consider having an intake vent as well with an electric damper that opens when the exhaust fan comes on. Get the intake air from the soffit on the shadiest (coolest) side of the building possible and have the exhaust on the opposite side of the garage from the intake (if possible).

If you want to get fancy, you could probably control the exhaust fan with some type of thermostat.

Another option that would help is to insulate the ceiling above the garage if you have access to it. That would keep the heat from getting into the sealed attic storage area but it would also keep the heat inside the garage if you didn't put in the exhaust vent. Since you already have spray foam installed, any additional insulation you put above the ceiling should not be faced or have any kind of a vapor retarder. Mineral wool or blown cellulose would work well.

DC

 

[BillK]

If the attic is "sealed" then it is probably getting hot up there even without the cars. If it is 90 deg outside the attic is probably just as hot. Ventilating the attic is only going to get it down to outside temperature.

 

[tyme2par4]

Put in a heat pump water heater. It will take that heat and make hot water for you.

 

[CoogarXR]

My unvented garage attic is blazing hot, without any help from the cars, and I'm in Ohio!

 

[bazar01]

I leave the garage door open after parking a hot SUV inside until night time then close it. It cools down a lot.

 

[theoldwizard1]

Extra large fan on a 15 minute timer with the garage door open.

Anyone with a hot attic should get a thermostatically controlled roof fan.

 

[Falcon67]

Normal here for the house garage to run 100~110F in a summer afternoon and still be 95+ at 7:30AM. I don't much worry about it.

>baking all the stuff I have stored in the attic.
Well, if I have something I don't want baked I don't store it in the attic. Runs 120~140 up there, more or less.

 

[Dirtydan69]

I'm in AZ like Mesa guy and thus winter I'll be blowing in insulation and adding a split. For now I have a crawl space duel fan setup that I have on one of my "suicide vent" the top one of course. It helps take the edge off but really doesn't cool but maybe a couple degrees. I'm surprised that here in AZ most houses don't have attic vent fans.

 

[shade]

I blew in cellulose on all walls and the ceiling above
framed in a nice through the wall 18k unit
garage door insulated

i pull in hot cars to the garage which stays at a nice 78* even when its 115 out.

 

[elite1]

Whole house attic fan would help. Just make sure you have attic ventilation.

Turn this on and, you would evacuate all garage air within a few seconds and would cost pennies to run.

Just a thought. Cheaper than A/c.

 

[yhprum]

Wall exhaust fan near ceiling with thermostat. Heat rises and gets sent outside,