This is why a car with 48 square feet (4.5 m²) of cabin gets so hot so fast - it's intaking 2400 watts/8000 BTU/hr of heat. So let's say all in all, 50% gets through. The reflectivity of the roof and walls help. but walls count too, so that's kind of a wash. That's really a square foot directly facing the sun, so it'll be less if you're not at the equator at noon. However, your house is in sun, and that means it is being actively heated by about 100 watts (300 BTU/hr) per square foot (around 1 KW/m²). If it were always night, or if your house were entirely in shade, this would not be an issue. Your body will force you to open a door or something because it will become unbearably hot within minutes.
#Temp outside windows
Why might my house be heating up even when its cool outside?įor the most vivid example of solar gain, sit in your car with everything off - A/C off, blower off, windows rolled up tight, doors shut tight. I presume this is a sign of some general inefficiencies in my house's thermal-insulation-design. I realize this is likely house-dependent, but I've lived in more or less the same "kind" of house for the past decade or so: wood frame, insulation-in-attic, single pane windows, and a few trees around providing shade for the house (although certainly not enough to shade the entire roof). However, it still seems strange to me that if the AC should kick on (aka the house is warming up) at all if it is 2-5☏ (1-3☌) cooler outside than the temperature I have the AC set to. In that sense having the AC run periodically is not actually crazy, mainly just to keep the humidity down. Basically, there are only 1 or 2 months of the year when it is both cool and dry enough to open your windows in Florida (IMO). Note that the obvious answer is "Just open the windows", but for those not familiar it is usually 80%-90% humidity outside, and even 76☏ (24☌) isn't pleasant at 80% humidity (it's also a recipe for mold, which has been a problem for me). I've noticed that even when it is cooler outside than in (say the AC is set to 80☏ (27☌) and the weather is 76-78☏ (24–26☌) outside), my AC still runs periodically throughout the day. I'm a life-long Florida resident and have had this experience in a few houses.
It seems strange and I'd like to understand why it happens so that perhaps in the future I can make my house more energy efficient. I've had this experience in multiple houses, so I presume it's not just caused by some sort of one-off issue with an AC or thermostat. It's cool outside but I know that my house is heating up because my AC kicks on periodically. It's probably a ridiculously easy one to answer.
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