Questions tagged [energy-efficiency]

Questions about ways to measure and improve the ability to get useful work out of devices that consume energy. This includes coal, oil and gas as well as electricity.

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32
votes
9answers
6k views

Can I gain AC efficiency by spraying condensate water on the outdoor coils?

Last year with entirely too much time on my hands due to government-imposed shutdowns and quarantines, I was working from the basement and I noticed tonnes of condensate water going down the drain, ...
0
votes
1answer
37 views

same-sized alternatives to F14T12 bulb

I have two bathroom light fixtures with very old magnetic ballasts and F14T12 fluorescent bulbs. These are, of course, a 1.5-inch diameter. I've been doing some bathroom renovations and I thought this ...
24
votes
13answers
5k views

Do smart or programmable thermostats actually save money?

I am looking at replacing all the thermostats in my house. I have hot water baseboard heat and forced air A/C. Each room's baseboard heat is controlled by a thermostat in that room. I tend to prefer ...
1
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0answers
35 views

How can heat pump water heaters be more efficient when they just use heat from heated space? [duplicate]

I understand the principle of heat pumps, and it makes sense that a heat pump / AC split system is more efficient then for example resistive heating for heating a house. In this case, the heat pump ...
3
votes
2answers
81 views

How could I insulate a thin hot roof and bring it to current Southern CA code?

So we started an exterior remodel today, and found that our roof construction is way more mickey mouse than I thought it was. Our house has vaulted 2nd floor ceilings through most of the 2nd floor ...
2
votes
2answers
59 views

Is there any considerable advantage to a forced air-to-air heat exchanger over just cleverly positioned positive pressure forced air intake?

This is from a typical North Western European housing perspective where most (older) buildings will not have forced air/AC/heat pumps etc. for various reasons, and most houses are only heated using ...
2
votes
2answers
70 views

Replacing 2 hot water heaters with 1

I've recently purchased a home that has two hot water heaters - one at each end of the house. One in the garage, one in a closet. They're both showing their age, and both cost quite a bit to operate. ...
2
votes
1answer
50 views

Determine highest “carbon reduced per dollar spent” option for reducing pollution generated by home?

I've been talking with friends and coworkers about how I can reduce the amount of pollution generated by my house (heating the air, heating the water, cooking the food, etc.) Everybody has a ...
1
vote
1answer
49 views

Would down-stuffed curtains stop heat loss through windows?

My home has some very big 6 ft by 8 ft windows likely a big source of heat loss and is contributing to high heat bills. It would be too expensive to replace them with modern vinyl windows and the ...
0
votes
1answer
65 views

Run mini-split heat pump heads at different temperatures

I vaguely remember the contractor who did maintenance on our ductless heat pumps two summers ago telling us not to set the thermostats of the two small heads that share an outdoor unit to different ...
0
votes
2answers
76 views

Why G23 energy-saving lamps need ballast, does it make sense also for LED type?

IKEA Lival desktop lamp (like this) use a huge adapter plugging into power-socket, which should be ballast/transmitter. The lamp uses a G23 bulb from e.g. OSARAM DULUX S11 W. I feel very strange it ...
0
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3answers
46 views

Letting a thermostat regulate temperature, or do it myself? [closed]

I always hear people say that it is more efficient to let a thermostat regulate the room temperature. Well, I do not have a thermostat, but I have an electric heater with on internal one. Not a exact ...
0
votes
2answers
119 views

California Title 24 implications for bypassing ballasts in my 4-pin (GX24Q) fixtures

I've gotten fed up with the recessed 4-pin GX24Q fixtures in my kitchen that were required by California Title 24, after removing a burned out (and relatively expensive) CFL, cracking it in the ...
1
vote
2answers
51 views

Removing excess HVAC ductwork for efficiency

I have central ac in my home and at some point the kitchen was redone, blocking an existing vent permanently. The flex HVAC ductwork leading to the vent (probably 8 feet of it) is still there. Should ...
0
votes
3answers
181 views

Do plugged in chargers always use up energy? [closed]

I always make sure that all chargers with no device attached (mostly laptop and phone chargers) are unplugged so that they don't use up electricity. I guess it used to be a reasonable approach. I was ...
1
vote
0answers
40 views

How best to capture and move the heat from oil furnace stove pipe more efficiently throughout room

In my basement the stove pipe that goes from the oil furnace to the chimney is always hot, so I feel like I should be capturing this extra heat and moving it about the basement. How do I keep this ...
0
votes
1answer
48 views

How will a hybrid water heater perform in less than optimal conditions?

I'm thinking of getting a heat pump hybrid water heater (this one maybe); The operating conditions will be technically within the prescribed range but less than optimal. I'm wondering how I should ...
0
votes
1answer
37 views

Using radiant barrier to keep a room warm [closed]

I have been told (including in comments by awesome user Unslander Monica) that a foil sheet placed on the interior side of an air-sealed window can help prevent radiative heat loss through that window....
0
votes
1answer
35 views

Window film affixed to the wall around a window?

Useful related questions: here, here. I live in an apartment with a window that I want to insulate during the winter. I am currently using one of those shrink film kits and it seems to be working. ...
0
votes
0answers
11 views

Impact of small gaps in insulation on conductive and radiative heat loss?

When insulating a room , what is the effect of small gaps in the insulation on the degree of conductive heat loss? On radiative heat loss? What other major factors affect the answer? (I presume that ...
1
vote
1answer
54 views

Can I use two layers of window film to create a narrow, convection-reducing gap?

This is a follow-up to this question. The official answerer A.I. Breveleri writes: The ideal separation distance between film and glass is 1/2 inch. Even 1 inch is too thick as it allows the trapped ...
0
votes
1answer
51 views

To maximize heat in winter, should I remove my window quilt during the day?

Let's say it's -5 deg C outside and I'm inside a building with a moderately efficient window and a window quilt. Will I stay warmer if I take the window quilt down during the day and put it back up at ...
0
votes
0answers
20 views

Wool batting window quilt? [duplicate]

Would it make sense to use wool batting like this as a window quilt? Why or why not? What factors would affect its suitability? For context, I propose using this on the inside of one of those shrink ...
0
votes
1answer
52 views

Aerogel winter window quilt?

Would it possibly make sense for me to use aerogel as a seasonal window quilt? It may depend critically on some other factors; if so, what are they? In particular, I have heard that aerogel designed ...
0
votes
0answers
14 views

R-value of textiles

Does anyone know of any good sources of information about the R-value of various textiles, like blankets and quilts of various materials/thicknesses in various conditions?
1
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3answers
146 views

Help me test my electricity usage monitor?

I just got one of these; I love it and it seems accurate. But I would like to check its accuracy. Can anyone think of an appliance with very predictable constant power consumption that I could use to ...
0
votes
1answer
43 views

How does denim insulation perform at low ambient temperatures?

I am interested in how denim insulation like this performs at low ambient temperatures. Does anyone know? I am most interested in performance measures like R-value and what other factors affect this. ...
-1
votes
1answer
52 views

Insulate my window with water heater blankets?

I have some windows that I want to insulate at night during the winter. Would it make sense to use water heater blankets, doing something or other to secure the edges? I'm wondering whether you think ...
2
votes
1answer
193 views

How does the insulation value of multiple layers of insulation compare to a single layer of the same total thickness?

If I insulate a surface with two sheets of rigid foam insulation with thickness x, or with one sheet of otherwise identical rigid foam insulation with thickness 2x, how should I think about the ...
0
votes
3answers
89 views

Resource comparing power consumption of different water heaters?

I am looking for a website the compares the "real-world" energy consumption of different electric tankless water heaters under different conditions. Any ideas?
1
vote
1answer
135 views

What is the difference between heat lamps and infrared space heaters?

Maybe these are pretty much the same thing. I'm interested in the difference between heat lamps and infrared space heaters, especially as regards How they are normally used How they should be used ...
0
votes
1answer
84 views

How to keep my tankless water heater safe in a cold room?

I have a room in my apartment that can sometimes get around 40°F (4°C), and that's where my new tankless water heater is installed. Should I take any special precautions to keep my pipes from freezing ...
0
votes
2answers
40 views

Insulate my windows from the outside?

I have some windows that I want to insulate at night during the winter. I have energy star windows, thermal drapes, and cellular blinds and those plastic window film kit things, but I want to reduce ...
2
votes
2answers
75 views

Insulate my windows with fiberglass?

I have some windows that I want to insulate at night during the winter. I have energy star windows, thermal drapes, and cellular blinds and those plastic window film kit things, but I want to reduce ...
1
vote
1answer
703 views

Is TXV required when an appropriate piston/orifice is used?

I had a Goodman GSX140181 1.5 Ton 14 SEER Air Conditioner R-410A installed with a Goodman CHPF3636B6 3 Ton Horizontal A Evaporator Coil installed by a contractor. It came as a kit, along with a ...
1
vote
2answers
72 views

How to calculate efficiency of old Westinghouse furnace VS new variable speed Furnace

We have an old Westinghouse Forced Air Furnace (model FGUB137EG). It's been working fine, with the occasional pilot lighting issues since we moved in 6 years ago. We've been thinking about adding ...
1
vote
1answer
65 views

Minimal temperature setting for hot water heater to prevent legionella

I own a small apartment which I rent out to tenants. The apartment has an electric hot water heater with 80 liters. I now realized that my tenant reduced the temperature setting to only 32 degrees ...
0
votes
0answers
43 views

How to calculate whether it's worth turning on a fan to bring warmer air to a heat pump hot water heater?

I have 4 new Rheem 50 gal heat pump hot water heaters being installed in the basement of my home/multiunit property that is a 4-unit building (one heater per apartment). Generally speaking, the attic ...
2
votes
1answer
85 views

Open duct found in ceiling

I cut a hole in a basement ceiling drywall and found an open duct at the end of the span between the joists (see photo). I'm sure this isn't good for the efficiency of the hvac system. What are the ...
1
vote
1answer
96 views

High Efficiency Furnace vented through the roof. How screwed am I?

I'm investigating installing a central air system and in doing so it was brought to my attention that my high efficiency furnace may not be installed properly. I'm in a narrow semi without much ...
1
vote
2answers
340 views

Bathroom remodel & Calif Title 24 requirements

I'm told that any permit work in my bathroom will trigger Title 24 requirements for humidity sensing exhaust fan and motion sensing lighting. I've found basic info but am confused about a couple of ...
0
votes
1answer
77 views

Radon remediation in a part-time home

We have a second home that we use approximately 1 week/month year-round, and more in the summer. When we purchased the home in 2019, it was tested at 9pCi/L, and a remediation system was installed ...
2
votes
3answers
110 views

How to track energy usage per zone?

I have an old oil boiler with 4 zones, individual zone pumps. I'm trying to track heat usage on a per-zone basis. Would it be possible to simply track how often each zone pump runs and apply their ...
1
vote
0answers
59 views

Any benefit to air sealing fixture boxes in cathedral ceiling? If so, ideal method?

New house. We have a cathedral ceiling. Foam vent baffles from eave to ridge, r-38 fiberglass (unfaced), sheetrock. Most of the lights in the ceiling are LED puck lights that have a built in gasket ...
2
votes
2answers
78 views

How can I trust a local window manufacturer? What to research or check?

I'd like to support local and there's 3 companies nearby that offer custom made vinyl windows. They all seem to be >30 year old companies, which I respect a lot. I did a ton of research it seems ...
0
votes
3answers
708 views

Weatherstripping for inswing exterior door with clearance problems. Clearance door sweep?

How would you weatherstrip this gap under an inswing exterior door? The door threshold is not very high, and the door already drags a bit on the interior carpet, so many styles of door threshold are ...
0
votes
3answers
299 views

Should I convert my 4-stroke engines from regular gas to propane

I am planning on converting my portable-generator/lawn-mower/snow-blower from gas to propane. This was my analysis; could you please comment on the facts, analysis & conclusion? Am I on the right ...
0
votes
1answer
28 views

How to find a very low U-value replacement window for a bathroom?

I found 0.27 for a Pella 250 series at Lowe's. I would like to find a window with a lower U-value. How do I go about that?
0
votes
4answers
81 views

Would triple pane give me better results than double pane in a key location (bathroom)?

I am ordering replacement windows. I'm going to go with double-hung in the bedrooms and bathroom, and casement above the kitchen sink. Double-hung vinyl with added foam insulation in the frames. ...
2
votes
1answer
171 views

Big box Pella vs. Pella Pella

The Pella salesman claims that his replacement windows are better than the Pella replacement windows that are sold at the big box stores. Is that true? I've done my best to ask the windows people at ...

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