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22 votes
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How to get rid of CO₂ in a house with A/C in hot summer?

You want an high-efficiency heat exchanger. https://en.wikipedia.org/wiki/Heat_recovery_ventilation Basically, you pipe in fresh air, but have it cooled before, while you heat out the air that is ...
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  • 1,453
20 votes

How to get rid of CO₂ in a house with A/C in hot summer?

That's a really high CO₂ level. You need to figure out what is causing it and fix that, it's not normal. Gas fired appliances with leaky vents are the most likely suspects — hot water heater, dryer? (...
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16 votes
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second window for toilet on rented apartment

Window insulation film. https://www.youtube.com/watch?v=gwkmgbzGG-g This window kit is clear plastic sheeting. You attach it with double sticky tape along all edges. When I did this the last step ...
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  • 5,498
14 votes

Why does my furnace only work after power reset?

Your furnace controller board is very likely indicating a trouble situation and shutting itself down. This is the equivalent of a car turning on its check engine light and not wanting to move. ...
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13 votes
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Insulating a wooden shed to provide strong heat rejection

Insulation works both ways, so it'll reduce the heat coming in from the sunlit outer walls as well. Small windows are also favourable in these conditions. For warm but not over the top situations, you ...
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  • 733
13 votes

Will higher BTU A/C inverter not work in room that needs 18K BTU?

This answer only applies to inverter-style mini-splits. Short answer: Yes, you can install a 24K BTU inverter-style mini-split even though the cooling load only calls for 18K BTU, provided that your ...
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  • 3,907
12 votes

Will higher BTU A/C inverter not work in room that needs 18K BTU?

HVAC sizing is a wild guess When trying to determine the correct size for heating or air conditioning, what matters the most is the quality of the insulation in the walls and ceiling the "solar ...
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7 votes
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Will the concrete slab in a partially heated shed conduct a lot of heat to the unconditioned area?

I'd have no concerns about doing what you describe. I've seen it done many times here in frigid Minnesota. Build your walls (using treated lumber and suitable nails where it contacts the slab), ...
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  • 106k
6 votes

How can I heat up my apartment to kill bedbugs in Southeast Asia?

The bigger issue is that if there are bedbugs in your apartment, the whole building is probably infested. Your best bet is probably to isolate yourself from the bedbugs and set a CO2 bedbug trap. ...
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  • 6,651
6 votes
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Knob Identification

That has nothing to do with your heating system. That is an old telephone jack box. If you move that cover in the Open direction, you should see it uncover a 4 wire telephone jack. The slot is to ...
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  • 2,485
5 votes

On a true 60 amp 240 volt circuit will each side of the breaker carry more than 30 amps if required?

No, that's not at all how it works. This feeder will provide 60A @ 240V. That is 60A on each leg of the panel, NOT 30A on each. The 60A is available, you use what you need up to roughly 60A, again, ...
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5 votes
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Can dryer vent touch ABS pipe?

Residential clothes dryers typically vent at a temperature of around 130°-165°F (54°-74°C). Wikipedia gives the glass transition temperature (colloquially the melting point) of ABS as 221°F (105°C). ...
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  • 6,825
5 votes
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Understanding electric heaters power

Well stoves aren't space heaters. Remember that. If you think your stove heats better, its probably due to your stove having 50 AMPS at 240V available to it. That' 12,000 watts. Any portable cheap ...
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5 votes
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Dry sauna using heat gun

That's fairly silly. Of all the consumer electric products on earth, heaters are inherently the least expensive. That is to say you can get cheap, good ones. A 1500-watt cheap tossie is $12 and ...
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5 votes
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How to heatproof an eastward sliding glass door

The blinds absorb energy from the sun, but your problem is... they're inside. So the sun just heats the blinds, which then heat the room. Blinds or curtains make the room darker, but they do nothing ...
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  • 6,677
4 votes
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Gas / baseboard heating should be on but it's not -- how to investigate?

Based on the photos you provided I am sure that your heating system is hydronic, i.e. water is heated by the furnace and then flows through your baseboards giving up its heat to the room. The unit on ...
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  • 1,324
4 votes

Understanding electric heaters power

Power (heat) is measured in watts. A heater with a higher wattage will put out more heat than a lower wattage heater. In the USA, most portable heaters will be limited to around 1500 watts due to ...
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  • 13.7k
4 votes
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Any suggestions for incorrectly-wired thermostat?

Since you have baseboards, you don't have a fan. That means it's probably a 2-wire thermostat. Check the voltages with a voltmeter to make sure you're not playing with 120/230V line voltage. (it's ...
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4 votes

How to get rid of CO₂ in a house with A/C in hot summer?

What type of air condition are you using? Some only cool the air inside, while others use fresh air from outside. In a cafe or club there are norms about how much fresh air the air condition must put ...
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4 votes
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Can I warm up "cold patch" in a microwave?

Microwaves work by exciting the molecules in liquids that then trasfer their heat into surrounding materials. To be safe, "microwavable" products have water in them so that the water molecules are ...
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  • 14.4k
4 votes

What temperatures can a heat gun raise a material up to?

YES a common "garage" type heat gun will heat up the material enough to reshape it. In fact, I know from experience that many household heat guns will heat up plastic enough to melt it, so be very ...
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  • 33.5k
4 votes

Radiant heating with metal rods

You can do whatever you like. How well it works may vary drastically. In this case, the odds are that it will work very poorly. More functional options tend to be a bit more complex and involve ...
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  • 137k
3 votes
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Heat shield for pantry cabinet?

Range hood vented to outdoors. Overlay heat resistant materials over cabinet, CBU/porcelain tile or CBU/stainless steel sheeting CBU = Cement Backer Unit AKA Cement Backer Board
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  • 12k
3 votes

Gas furnace air is cooler (but NOT COLD) during bitter cold days - why?

I'm going to suspect poorly insulated ducts running in unconditioned space as a first guess. I don't know the layout of your system, but it's very common to take duct runs up into the attic, and even ...
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  • 137k
3 votes

Gas furnace air is cooler (but NOT COLD) during bitter cold days - why?

There should be a nameplate on the unit, which among other things will list the expected temperature rise across the heat exchanger. This value tells you how much the furnace should be expected to ...
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  • 128k
3 votes

Dangers of Heating a Bedroom up to High Temp

You mostly want to protect yourself and pets from harm: As you can imagine, you do not want to be in the home while it is this hot. Not only does this give the bugs a way to escape by climbing onto ...
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  • 106k
3 votes

Is it bad to close furnace dampers in order to balance temperatures seasonally?

Yes, if you close too many dampers, you can overly restrict air flow which will burn out your furnace motor. However, what’s more likely is air flow will increase in the ducts/grills that have not ...
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  • 22.6k
3 votes
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Is it bad to close furnace dampers in order to balance temperatures seasonally?

Too long for a comment. I agree that closing too many it can cause problems. When installing main trunks in multi story homes I like 60/40 in the main trunks in summer 60% upstairs for cooling and 40% ...
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  • 98.3k
3 votes
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Curtains for a non-air-conditioned apartment in the tropics

I grew up in the 1940s and 1950s in hot, humid south Louisiana and hot, less humid Dallas, Texas. We had no a/c in Louisiana and starting in about 1954 in Dallas we had window units in some rooms, but ...
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  • 19.7k
3 votes

240v baseboard heater on a 120v circuit using a step up transformer ?

Heaters are cheap. There'd be no reason to do this! An electric heater is one of the simplest appliances in the world -- so it is inherently very low-cost. It's not cheaply made, it's just simple ...
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