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2
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3answers
60 views

How can I add thermal mass to my house?

We're part of a real-time pricing program with our electric utility company, and a good strategy for offsetting electricity use during peak demand times is to pre-cool the house. The more thermal ...
1
vote
1answer
29 views

Should storm windows be removed if AC will be on and windows rarely opened?

We generally run our AC most of the day. I am wondering if it is a detriment to leave the storm windows on (b/c they create a pocket of hot air) or a potential benefit (by reducing the escape of cold ...
1
vote
2answers
743 views

Why isn't my mini fridge staying cold?

My mini fridge has full power, but I come home after a couple of days to find that the compressor has shut off and everything has defrosted and the fridge isn't cold anymore. I can turn the knob and ...
-2
votes
4answers
60 views

Alternative ways to Cool body in hot apartment with many floors?

You are forbidden to build a cooling system and no big investment is allowed. Your room is about 27-30 celcius and it takes hours until the room temperature is about 25-26 celcius again, making ...
1
vote
2answers
24 views

What is the most efficient window design to maximise cooling in a tropical climate?

I am building in equatorial Indonesia. My building is roughly 10x4.5 metres in footprint, and it will be a two storey (3.5 metres each) concrete structure. The building backs directly onto a limestone ...
3
votes
2answers
703 views

What is the name of these silver curtains used to reflect heat energy back outside?

Some people use aluminum foil to reflect heat on windows but I find it very depressing and bad-looking thing. My Chinese friends use 台州涂银反光窗帘布 but I have no idea what it is in English: they translated ...
1
vote
0answers
41 views

AC capacitor testing with multimeter

When running through my check list to start the AC for the spring/summer I noticed the outdoor fan was not running, hence no cooling. I'm using a basic digital multimeter to test a capacitor with the ...
2
votes
3answers
107 views

Will a 2-stage heat pump cool my upstairs on low stage?

I am currently upgrading my furnace from an oil furnace/AC combination to all heat pump. I am considering two stage vs single stage heat pumps. I understand that two-stage will supposedly give me ...
1
vote
2answers
420 views

Options for a small, single room AC with no windows, no drainage possibilities, and not water vapor based

There is a room in our apartment which we use as an office that is always 10 to 20 degrees warmer than the rest of the house. The apartment is cooled using a standard central AC, however the room in ...
2
votes
2answers
5k views

Why would ceiling fan reverse air flow without me changing directions?

I have this exact ceiling fan, and so far it has worked nicely. It is mounted in my bedroom, I believe height to floor is about 12 feet and the rod from the ceiling to the actual fan is about 18 ...
1
vote
4answers
124 views

Is it crazy to put a hole on a fridge?

I want to buy a mini fridge, not for food storage, but for storing stuff I don't want to evaporate (gets hot in my room during summers) or preserve. I'm thinking maybe once in a while I want to make ...
1
vote
2answers
336 views

Refrigerator big temperature difference between bottom and top shelf

I feel that my refrigerator is under-performing. I have the thermostat set to the coldest position, waited 24 hours, and with a thermometer it reads 4c on the lowest shelf, and between 8c and 9c at ...
2
votes
3answers
4k views

How to prevent incandescent light bulbs from heating up the room, safely?

Currently I have ten 60W incandescent light bulbs heating up my room, very little ventilation, and no ideas on how to stop them from making the room so very hot. If I had other lighting option, I ...
2
votes
8answers
13k views

How do I keep my house cool especially my terrace during summer?

I live in Bangalore in an apartment on the top floor and during summer, my terrace (built of concrete) absorbs a lot of heat. When I come home and switch on the fan, it ends warming my room and it is ...
0
votes
1answer
42 views

Improving insulation on windows and preventing heat loss

Here are the images of my window (currently it's 18F/-8C outside, 74F/23C inside): Now, this condensation / ice forming gets even worse - on some days whole bottom of the window from the first ...
0
votes
0answers
23 views

How do I wire a universal honeywell control board to a york LP gas package unit?

i bought this universal honeywell control board and I'm trying to figure out how to wire it up. I'm trying to wire it up to a York gas package unit. I have looked all over the web for pictures and ...
2
votes
4answers
184 views

West facing master bedroom getting hot from afternoon sun

I am renting a townhouse where the master bedroom is always getting way hotter than the rest of the house. It's the only room on the top floor on the west side of the house and only has one window on ...
6
votes
6answers
7k views

Should I open the top or bottom of double hung windows?

I'm a new home owner and was wondering if there is a "right" way to use the double hung windows in the house. Should I open the top or bottom? Is there a seasonality to it? Does it even matter at ...
0
votes
1answer
43 views

Can I vent room air to the outside?

The building interior gets hot during the day and stays hot during the evening when it is much cooler outside. It would be a really great option to simply vent the hot air outside instead of having to ...
2
votes
1answer
106 views

Is infrared blocking film effective in reducing temperature inside a room?

I was going to put a foil on windows, but found a film that is alleged to reflect rays from infrared spectrum, thus preventing 60% of sun heat of entering a room. Any criticism on it? Or personal ...
3
votes
4answers
3k views

Apartment on the top floor gets very hot - cheap, eco friendly ways to keep the place cool?

I have an apartment on the top floor of an apartment building (the community roof is right over us). In summer, the place gets very hot! I can't start a community garden upstairs and am dying with the ...
7
votes
5answers
5k views

How do outdoor mist-cooling A\C units fare in real-world usage?

I live in Phoenix where summer outdoor temperatures regularly exceed 110°F and humidity around 15% or lower is not uncommon. In this environment a mist system can easily pull the temperature down ...
1
vote
1answer
75 views

What is causing this air-conditioning unit to cool on cold days?

This is a temperature log from a reverse cycle air conditioning system that has run fine for getting on for 30 years. It has suddenly started to blast out cold air on days when it should be heating. ...
0
votes
1answer
20 views

humidifier trouble beware

Why would a humidifier with whirlpool action be pulling air through the floorboards of the lower flat in a two flat house built in the 20's with no insulation, bring fumes into the flat from the ...
0
votes
1answer
44 views

Should there be a cap next to my furnace ac drain?

In the picture below, the left side has a good amount of airflow while the ac/blower is running. The tube on the right is the drain that the condensation flows out of to the floor. Should there be a ...
2
votes
1answer
3k views

What type of motor do I need for my attic fan?

My attic fan motor appears to be on the fritz (makes a buzzing sound and the fan tries to turn but won't make it more than 1-2 revolutions without sticking). I'm trying to figure out what type of ...
2
votes
3answers
798 views

HVAC system that pulls-in cold air from outside?

My house has an existing forced-air heating system and I'm looking at getting central AC added in a few weeks' time (indeed, I've booked contractors for estimates next week). An AC system would keep ...
8
votes
1answer
269 views

Rheem Heat Pump A/C Mode Delay Cycle In Hot Weather

I have a Rheem 15PJL48A01 heat pump which has been working correctly for years, and is maintained properly. It is hot here currently and so it is operating in cooling mode. Yesterday and today, it ...
0
votes
1answer
2k views

Blower fan works w/ heat “auto”, not with a/c “auto” or on “on”

I've read the posts with the opposite issue, which have been helpful (you guys are amazing!) but still no solution. Problem is that the blower fan does not come on when system is on "Cool" and fan is ...
1
vote
1answer
73 views

Close Garage Door?

My wife insists the garage should be closed in the summer, because we run the AC inside. However - when leaving the garage closed, temperatures reach roasting levels better suited for cooking than ...
1
vote
0answers
11 views

How to add extra 24VAC wire (C wire) [duplicate]

I have recently bought a Honeywell rth9580 programmable WiFi thermostat. Unfortunately I have old electric heating/cooling system probably from 70's. The system is based on two relays (I guess ...
0
votes
2answers
124 views

Changing from 2 ton to 2.5 ton AC

Friend wants to give me their puron systems 13 sear 2.5 ton AC that they replaced. It was still working fine but 10 years old they wanted to change it out. I currently have a York 2 ton unit that ...
8
votes
1answer
26k views

How do you trigger the HVAC with wiring only?

I have a HVAC that has the usually wiring C R G W Y Pinouts What wires do I need to connect to turn on Heating? What wires do I need to connect to turn on the A/C? Is there a risk of damaging any ...
0
votes
2answers
299 views

Why does my HVAC begin vibrating and stop cooling at night?

I am calling a HVAC technician since this is probably too complex a problem for me, but wanted to hear some possible diagnosis. The symptoms are as follows: The A/C is working well during the day ...
0
votes
0answers
39 views

How to avoid heat when using a dehumidifier?

I bought a Stadler Form Albert. When not in use the RH is 75% nowadays, and 30C. Room is 18m2. If I let it run a couple of hours, it gets down to 50% but at the cost of heating the air to ~35C. ...
1
vote
1answer
3k views

Does running a dehumidifier with an AC unit save money?

I've done as much research as i can an every site i hit seems to have a different story on my question: "Will a dehumidifier save energy while running your AC through the summer"? The ones that say ...
0
votes
0answers
273 views

Would increasing the size of the A/C duct for my kitchen improve cooling?

As part of an ongoing kitchen project, I'd like to relocate the existing a/c register in the ceiling (which is located next to an interior wall) to the center of the room and upsize the duct (and ...
2
votes
1answer
3k views

How can I prevent heat loss through heater/air conditioner wall units?

HVAC experts out there... I live in Wisconsin and it gets mighty cold here! I have a condo with 2 wall units that are used for both air conditioning and heat. My heat bill in the cold winter months ...
0
votes
2answers
31 views

add a temp gauge or “dimmer” to cabinet fan

I have an AC cabinet fan cooling a cabinet that warms with 2 CPUs and a couple external hard drives in it that are on 24/7. However, the fan runs furiously fast and loud and it only really needs to ...
0
votes
1answer
1k views

Central Air duct does not blow

We moved into a new house last year, the central A/C works great for all the rooms (even for closet) but we have a problem in just one room. There is almost no air flow coming from that room's air ...
2
votes
2answers
1k views

Does our main air intake need an electrostatic filter if our furnace already has one?

We have an electrostatic filter on our furnace right where in main air intake connects. We recently had our ducts cleaned and they told us we also needed to have our main air intake cleaned (an extra ...
0
votes
0answers
70 views

how to cool your roof naturally?

I live in the multi floored gated community house in South India with the ceiling exposed to sun.On addition to this my windows are not exposed to open air. In summer it gets really hot as the hot ...
2
votes
4answers
5k views

How can I measure the r-value of a wall?

What is a reproducible test to measure the r-value of an exterior wall? Or even a specific spot on a specific wall? It needn't produce an absolutely certain result, but a good estimate with known ...
1
vote
1answer
582 views

What could cause a heat pumps line sets to be the same temperature when running?

The symptom I'm dealing with is that the heat pump system isn't cooling as much as it should. Tested it today, was about 79°F inside and outside; system was blowing air at about 73°F. ...
1
vote
2answers
235 views

What are the external airflow requirements for portable and window AC units?

I have a window well in a basement where I'd like to setup a portable AC unit (~10000 BTUs). There is a cover that I need to keep in place to avoid water collecting in the window well, but I could ...
3
votes
4answers
14k views

Is there a window or portable AC system I can use with an awning window?

My bedroom gets ridiculously hot and I taped tin foil over the window. It didn't help much. I'm thinking of getting an air conditioner but the ledge on the window is small and the window doesn't open ...
16
votes
4answers
30k views

Why don't programmable thermostats automatically switch between “Cool” and “Heat”?

While I can set my house to be a particular temperature, I still have to manually switch it between "Heat" and "Cool" mode, and this seems to be true of every thermostat (programmable or not) that ...
0
votes
1answer
2k views

Need help running and connecting a 'C' wire to my new thermostat [duplicate]

I have a Laars gas boiler that has 3 heating zones; basement, 1st floor, and 2nd floor. I want to replace the old mercury honeywell tstats on the 1st and 2nd floor with newer honeywell RTH9580 wifi ...
0
votes
1answer
1k views

Is it possible to use add-a-wire with my current configuration to add a C-Wire? [duplicate]

I only have four wires: Red, Blue, Yellow, and Green. My old thermostat jumps the R to RC and leaves C empty. I have a new thermostat that wants 5 wires, but I don't have C. I am not sure what the ...
2
votes
2answers
934 views

Why do air conditioners have thermostats, not humidistats?

I've noticed it over the years in various living quarters: an inside A/C temperature setting that's appropriate and comfortable for a given outside temperature is quite unbearable when the outside ...