Tagged Questions
3
votes
3answers
4k views
How much less power does a three-phase A\C unit use as apposed to a 220v unit?
I'm planning to install a 5 ton central AC. I'm deciding between a condensing unit that runs on 220V and a costlier unit that runs on 207Y three-phase.
My understanding is that three-phase motors use ...
7
votes
1answer
1k views
Why are almost all of my house's HVAC floor registers placed near exterior windows?
My current house is a single story built over a crawlspace and all the HVAC registers are in the floor. In all of the larger rooms, at least one (and usually more) register was placed near an exterior ...
5
votes
1answer
173 views
Is it possible to recover waste heat from a boiler?
I did a google search and came back with industrial products, but no residential prosucts.
I have a System 2000 boiler and hot water tank. When the furnace is firing, the temp of the exhaust through ...
5
votes
2answers
420 views
When insulating with closed-cell Spray Foam, what ERV and HVAC resizing considerations should I bear in mind?
I am building a 2800 sqft, two-story brick home in Austin, TX. I have heard many good things about the benefits of insulating with closed-cell Spray Polyurethane Foam (ccSPF)1, and have requested ...
1
vote
4answers
2k views
Are there efficient ways to provide combustion air to heating appliances?
In a previous question we established that there probably should be a vent between my utility room (which opens into the kitchen and living space in general) and the outdoors (in my case the attic, ...
9
votes
4answers
6k views
Does lowering the blower speed of a forced-air furnace lower its efficiency?
My gas furnace has two options for the blower speed: MED, and MED-HI. It had been set on the higher speed, but that was too harsh, so I lowered it to the slower speed. Does that have any impact on the ...
10
votes
11answers
4k views
How can I increase the heating efficiency of a forced air system?
What are some DIY ways to increase the efficiency of a forced air heating system?
Please answer in Community wiki fashion: 1 tip per answer.
Edit:
As @Jay Bazuzi pointed out, tips can also include ...
3
votes
6answers
2k views
Would putting a sprinkler on my roof help cool my home?
Anyone ever put a sprinkler on your roof to help out your A/C on unusually hot days? Just wondering if it helps.
