How effective are these at blocking heat?
497937
They suck. In addition, they will stain ANY surface they touch. I learned this the hard way and had to hire carpet cleaners to remove the black magnet stains on my carpet. It was $50 per room, $300 total. An easier thing to do is to remove the vent and then wrap the bottom of it with plastic wrap or aluminum foil. And then, close the louvers facing the top. That will keep most of the air out.
497938
This will block the air flow from a forced air heat vent. They come in different sizes for different size vents. Order one that fits the vent(s) you have. You can purchase a smaller one to block only a partial vent. However, they are not very strong magnetically, so if there is any air pressure at all, it could be ineffective. The more vents you have blocked, the more pressure you have in the system. If you are blocking a lot of vents, it might be better to turn down/off the heater altogether and use an area heater for the area you need the heat. Another solution is to buy an adjustable heat vent that has a lever that you manually adjust the air flow for one vent. Warning of caution though, don't block more than 50% of you vents, this will cause too much pressure and possibly cause a problem blower motor or blow a hole in the the ducting, both of which can cost a lot of money to fix. Even worse, over working the blower motor and backing up the heat in the heater could cause a fire.
497939
When we purchased the new heat and air conditioning we had to revent under the house. The old vents had large holes. The vent covers work well at keeping the cold out. We have never had a problem with any marks on the carpet, since if cut to size the bottom of the cover does not touch the carpet.
497940
These WILL block air flow, however, if you have a register that can be closed, meaning small louvers on the inside of the vent, my advice is to close these first, then apply the magnetic sheets.Do it this way will block 99% of the air flow AND you will not have to worr about air pressure blowing against the magnetic sheet.I have several that I use all the time in various rooms of the house at various times of the year.
497941
They work great if your vents are on the floor. I had trouble with them sticking to my ceiling vents.
713298
Hi Ron. I imagine that like any adhesive it would be better to apply these covers when the temperature is neither extremely hot or cold. I have had no issue with these staying on since I applied them, although the temperature range where I live only goes from about 50F (10C) up to 100F (35C). The covers look great & do there job protecting the duco. All the best, Bob.
862102
Yes...these covers are thin enough for the heating/cooling to get through effectively.
1624114
They do have a heat rating. I assume if you keep it under the correct temperature you should be ok.
2134939
I personally found that these are ineffective and got rid of mine. Better to have a solid insulated cover than these. They are flimsy, and blow away too easily and quite frankly, don't do much of anything. Except start a conversation on Amazon....
1482267
They claim 99.8 protection. I wore them during my recent Turtle Bay golfing trip. They seem to do the job. Arms felt cooler & no burn.
639916
depends on temp's. i get about a month of use out of them, they are sill effective even if you can not smell them tho
1532167
They will protect you from the heat very well, the main concern would be if they got enough flammable liquid on them. Kevlar is very easy to put out if it ever did catch on fire. As a welder I have yet to receive any arc or splatter burns thanks to these. To answer your question specifically, yes they would protect you from direct contact with flames and act as a heat shield. If your worried about flammable liquid soaking in you could always run the sleeves under a tap and wring them out which I do just to help with the summer heat.
1295956
Yes, they would work. I don't know if they would keep a dog cool enough in really hot days!
942168
I've not had any problems at all. But I don't have them touching my home. they hang from my balcony railing. I love them. They don't get hot either.
2206482
No. These are designed to prevent your insulation from heating up and catching fire from direct contact with light.
753459
NO!! I have had the cover up and down, and found little difference in the heat. I use the lowest setting in the summerand the middle setting in our Wisconsin winters and will be getting more for the house
647949
They make a difference of about 1-3 degrees in a smaller room. These are more for privacy than heat efficiency.
1992134
It says in the product description above (when you scroll down frim top) that they are 100 percent heat resistant... folks need to understand, you should use lower settings though... high can damage it...
448661
I bought mine four years ago from Amazon and am using them right now (0 degree temp outside!!!). I think they may put out a little less heat than they once did (though I'm not sure about that), but they're definitely still usable. Seven hours on, they're keeping my hands very cozy.
1693319
It blocks about 20 of visible light, and blocks a whole lot of heat.The amount of heat reduction is makes it all worth it.. My couch is right in front of a all day daylight window and its the difference between being able to sit on it at noon now vs it being a stove top burner.
2258848
I've not noticed but I only had them during this winter (cold). There's no reflective coating so I'm guessing they wouldn't keep the heat out. I'm assuming you're referring to something like a windshield reflector that covers the entire full windshield. Even if they were reflective they're not big enough to cover the entire windshield.