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13 votes

Why is my air conditioner causing rapid high CO2 levels?

One possibility is that you have: a very well sealed home a heat recovery ventilator (HRV) the HRV is only on when the system is configured for heating and not when it is configured for cooling In ...
manassehkatz-Moving 2 Codidact's user avatar
10 votes

How much air under tile is acceptable?

How much air under the tile is acceptable? Virtually none. Tile installers use notched trowels for a very specific reason: To allow the mortar to make consistent, supportive and bonding contact with ...
isherwood's user avatar
  • 142k
8 votes

How much air under tile is acceptable?

The Tile Council of North America (TCNA) publishes a handbook for designers. It's purpose is to provide bathroom designs and quality tolerances so that a designer can create construction documents ...
popham's user avatar
  • 10.5k
8 votes

How can I fit an HVAC vent louver alongside door casing?

I see three options to avoid cutting the molding: Cut the vent (register). Use a register that's less wide, e.g. instead of a register for a 12x6 duct use one for a 10x6 duct. Shift the duct opening ...
Huesmann's user avatar
  • 4,000
6 votes
Accepted

Is Complete Ductwork Required to Start the Condensor?

The air handler, blower, is designed to blow a certain amount of air over the cooling coils which in turn converts the refrigerant back to a gas from a liquid. It can only get the correct amount of ...
JACK's user avatar
  • 82.9k
6 votes
Accepted

Split air con : getting outside air inside

Split machines do not have, normally, large tubes inside the walls. The tubes between the inside unit (evaporator) and the outside unit (condenser) are only carrying refrigerant and so are small. You ...
Solar Mike's user avatar
  • 27.8k
6 votes

Why is my air conditioner causing rapid high CO2 levels?

Since the AC only recirculate the air inside the home, the possible source could be outside. Neighbors barbecuing ? burning dry grass or wood, sewage tanks, increased car trafic... and many other ...
Traveler's user avatar
  • 18.2k
6 votes

Are there any reasons to not remove air vents through an exterior bedroom wall?

If the vents are, as you say holes with a plastic grill on both ends, they are for air circulation from room to room, or what is sometimes called a "jump vent" that allows air to be ...
RMDman's user avatar
  • 33.6k
4 votes

Is Complete Ductwork Required to Start the Condensor?

They are correct the flow will not be correct but it will not hurt the system if fully functional , it may not cool as well because the lack of restriction across the evaporator. In a way they are ...
Ed Beal's user avatar
  • 103k
4 votes

Purchasing parts for my HVAC as a retail user

There are two separate issues going on here: There is a general problem that many distributors of technical products (whether HVAC, electrical, plumbing) are reluctant to sell to DIY. That is a ...
manassehkatz-Moving 2 Codidact's user avatar
4 votes

Is DIYing a replacement of Electric Furnace and Air conditioner worth it?

In the US, and probably many other places, there are very strict rules with respect to handling of refrigerant. That effectively means that beyond self-contained units (window air conditioners) and, I ...
manassehkatz-Moving 2 Codidact's user avatar
4 votes
Accepted

Do I need an adapter to connect this sprayer to my pneumatic compressor?

The top one is a hose barb. You slip a hose with a hose clamp onto it and tighten the clamp. The bottom one is a female half quick connect/push-in connect. You need the matching male half. There are ...
crip659's user avatar
  • 26.6k
3 votes
Accepted

How to pump gases? (not compress them, nor create vacuum, just pump)

You need an axial compressor, which (despite the name) is used to move gas/vapor (but can also function as a compressor in a closed system). A common name for this is a fan. For your purposes, it ...
Jimmy Fix-it's user avatar
  • 36.1k
3 votes

Can I vent portable air conditioner into the garage?

The problem with venting the AC into the garage is that you are then venting the garage into your workout room. I'd worry about CO poisoning. Garages are typically air sealed from the rest of the ...
Fresh Codemonger's user avatar
3 votes

Creating positive pressure to keep secondhand smoke from seeping into a studio apartment

Use a Window fan, blowing inwards. Presumably something simple and easily available would suit your purposes most easily. The best type of fan/blower for the purpose (a "squirrel-cage blower"...
Ecnerwal's user avatar
  • 222k
3 votes

Can I add an extension to an air intake for apartment central A/C? Is this a health or code violation?

If the air conditioning is not properly drained, the condensation will drip down into that section underneath which can cause mold. I also notice a hot water tank in the area. Another source of ...
Piemon's user avatar
  • 31
3 votes

How can I insulate a window that's tight against the rough opening?

You've asked an XY question (about your solution rather than the problem). I'm not going to answer it. Instead, I'm going to tell you how I deal with this problem. Do not drill holes in your windows. (...
isherwood's user avatar
  • 142k
3 votes
Accepted

What is the opening on the back of wood stove?

You'd have to look a bit more carefully, but that appears (based on what we can see so far and typical stove practices) to be an air-heating passage (heatilator) entry, with the air-heating output on ...
Ecnerwal's user avatar
  • 222k
3 votes

New 1500 watt (rated) dust extractor power consumption. Bad unit?

There's two things going on here. First: most anything cheap-ish with a motor lies about the ratings. It's entirely possible that things won't melt at 1500 watts but it actually draws less than that ...
KMJ's user avatar
  • 12.2k
3 votes

Master bedroom is unbearably hot and stuffy - what do I do?

Have you checked all your supply and return registers to make sure they are open? Are all your dampers open? What about adjusting registers in the cool rooms to allow more cool air upstairs? There are ...
JACK's user avatar
  • 82.9k
3 votes

Does a bedroom without ventilation violate code?

You don't need a "vent" to provide room heating, and I've never heard of a building code that required one. If you have any electrical outlets in the room, a small electrical heater will ...
kreemoweet's user avatar
  • 3,670
3 votes
Accepted

Would an automatic bleeder resolve condo heat problems?

The "bleeder" that is shown with the blue handle is nothing more than a hose bib. I would suspect that an automatic bleeder would be as good or better. As to an answer for your question of &...
RMDman's user avatar
  • 33.6k
3 votes

Two Zone Boiler System. One calls for heat, both zone return lines get hot

Probably thermo-syphoning (heat delivery without pumping. Hot water rises and cold water falls. Might be aggravated by the comically large iron lines (old steam system, converted to hot water? ...
Ecnerwal's user avatar
  • 222k
2 votes

When it's smokey out, why does more smoke get into the house in the mornings and evenings?

Most central HVAC systems have an “outside air intake vent”. This vent is used to provide fresh air into the home and is usually adjustable. Depending on the size of your home (and thus the size of ...
Lee Sam's user avatar
  • 23.3k
2 votes
Accepted

When it's smokey out, why does more smoke get into the house in the mornings and evenings?

The most common issue when you have make up air on a hvac systems is when the kitchen exhaust or bathroom exhaust fans are turned on they usually push 80-1000 cuft and that air is sucked in vis the ...
Ed Beal's user avatar
  • 103k
2 votes

How to Fix Central AC Bringing in Outside Air - Smokey outside

There are two ways I could think of that you could be drawing in outside air: The return ducting runs through an unconditioned space, like an attic or crawl space, and has a leak, or The supply duct ...
Chuck's user avatar
  • 599
2 votes

redirecting some air from outdoor A/C compressor into the attic to cool it down

Directing air from outside compressor into your attic would reduce the air flow from your compressor and probably decrease the cooling ability of it. A better solution would be to install an attic fan ...
JACK's user avatar
  • 82.9k
2 votes

is it legal to have the air intake (for heater and ac) coming from outside in CA?

Yes it is actually required for the combustion air. As for as the make up air or fresh air intake most newer homes do need them because the homes are sealed so tight that the build up of Co2 inside (...
Ed Beal's user avatar
  • 103k
2 votes

Would an electric furnace prevent outside air from coming inside my house?

You should investigate and upgrade the filtration of your air circulation rather than replacing your fuel burning furnace with an electric one. You need air exchange with the outside to get the oxygen ...
ratchet freak's user avatar
2 votes

Why would a polarized plug not fit into a polarized extension cord?

Since the question is "why" I'll try to answer that at the risk of many irate downvotes .. because one, or the other, or both, is not quite to spec! I guess that's obvious. This question ...
jay613's user avatar
  • 41.8k

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