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House windows icing up indoors

Marvin Windows Casement and Stationary. When its 0 degrees outdoors in winter, I keep the indoor heat at 70-72, humidity down to 32%, ceiling fans running vents open and not blocked to window, crank covers off. I've put 3-5 coats of gloss polyurethane varnish on effected areas of window wood window glass trim and wood sills. They are double paned windows. MW said there's nothing they can do.They are 11 y.o windows and the corners of the sills are molding. One pane frame rotted out completely. Our builder has the same problem in his home with his Anderson windows. A friend of mine had the same problem with the same MW windows as mine. What can I do?

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  • Linda Tipler
    Linda Tipler Jan 01, 2014

    I'll check into this, if my ridge vent goes all the way across. We have a dehumidifying vent in the attic roof and also an Aprilaire central dehumidifyer to keep the interior from 20% in some rooms -32% in the rest. After a couple days of 0-20 degrees outdoor temps, the moisture on the glass seems to finall dry off the glass by mid afternoon but I still have layers of ice on sills at the corners of the casements measuring about 1 x 2-3 inches x 1/6 inch thick. The wood interior trim of the glass pane of the casement are so cold and I think condensation forms off the wood. This melts over the daytime and starts building up again after sundown.

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If your house doesnt have a roof ridge cap vent in the center all the way across the house then moisture will stay on the window pane and sill and cause mold and rott.

Posted on Jan 01, 2014

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Any chance that you've got L1 and L2 hooked up to the same leg of the main? That would still give you 120 on each but not 240 from L1 to L2 like it should be. I'm not familiar with the LG system, but I would think that a comm line would have two wires.

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SOURCE: need to know the tonnage

Hi,
Rule of thumb is 450 sq ft to one ton of air, so you would need a 3 1/2 ton system.

Posted on Jul 28, 2011

SOURCE: Casement Window Placement of Unit Meant for Double Hung Windows

I've had the same issue and solved it by installing the casement unit in the proper configuration (upright), leaving the casement window itself open (or, at least, closed right up to the side of the casement unit) then using a piece of plexigas to "close" the top section of the window. The plexiglass, when cut properly, will fit against the window frame and then some quarter-round moulding on the room side of the plexiglass will fasten it securely. You can add a bead of caulk on the inside to be sure there are no drafts/leaks. I've done this with two casement units in my home and have had no problems at all with the installations.

Posted on Aug 13, 2012

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SOURCE: split unit, I get heat but no cold

check for a signal on a demand for heating at the ondensor and thermosat

Posted on Oct 20, 2012

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How do i size up a new high efficency furnace and AC unit?


There are factors in estimating the amount of btu needed, insulation, sun facing, windows, and basicaly How to Calculate BTU Per Square Foot

Apr 19, 2015 | Heating & Cooling

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Hi,My remote do not get the good temp in my house. Ex: I set to 80F in heat mode but the thermopump operate slowly and dosn't get hire than 70-72F. The remote see the unit and all. Is the sensor in th


You have a heat pump.
Once the outdoor temperature falls below 36 degrees, heat pumps will sharply lose their ability to heat.
If you are getting a 72 degree indoor temperature when the outdoor temperature is 28-30 degrees, the heat pump is performing up to spec.
On heat pumps, the air coming out of the nearest air vent to the unit should be heated approximately 40 degrees warmer than the air entering the unit.
If you have a 70 degree indoor air temperature, the heat pump should be supplying 110 degree air at the closest air vent to the indoor unit.
Gas heat is a much better heating source where outside temperatures are commonly below 36 degrees.
Even electric furnaces perform better than heat pumps under these conditions.

Nov 30, 2014 | Heating & Cooling

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Front grill


Check the air filter and if it is dirty, replace..
Turn equipment off and let the ice melt.
After ice melts, place a/c in cooling mode and set the thermostat to 3 degrees below room temp display.

The indoor unit fan should start blowing cold air immediately and then turn off once the room temp drops one degree below the cooling temp setting.
If the indoor unit does cycle off, check the outdoor unit and make sure it turns off at the same time.
If the outdoor unit continues to run and the indoor fan is not running, the indoor unit will ice up.
A defective compressor relay that is stuck in a closed position will cause icing of the indoor unit because it keeps the compressor running when it should turn off with the indoor fan.

Do you have an error code being displayed on the controller?
Is there an led light that is flashing on the indoor unit?

Another possibility causing the indoor unit to ice up is if the freon in the system starts to get low.
Make sure the ice has all melted for this next check.
Pretty easy to check without special tools.
If the air filter is clean and there is no dust/ dirt blocking the fins on the indoor unit, turn a/c back on to cool and check that the indoor unit fan comes on and is blowing air good.
Once everything seems to running good go to the outdoor unit.
There will be two lines with black rubber insulation covering them.
Peel back the insulation three inches on each line and observe the copper lines.
If either line starts to frost up the a/c system is most likely low on refrigerant.


Another cause of indoor unit icing could be that the aluminum fins behind the air filter are clogged with dust or other foreign material.
This would block the air that must be pulled in causing the indoor unit coil to become too cold due to lack of air flow and it will ice up.

Operating the cooling system when the outdoor temperature is below 60 degrees can cause the indoor unit to ice up also.

I'm Robert.
Florida certified a/c contractor. 30 years experience.
Hope this helps.


Mar 18, 2014 | Fujitsu Heating & Cooling

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Make sure the indoor filters are clean. The outside unit will continue to run until the indoor reaches the temperature you have selected. Dirty filters can throw the temperature out. Its common for outdoor units to freeze up when on heating mode if the ambient air temperature is below 5 degrees Celcius.. The machine should however, defrost itself. There could be a problem with one of the pipe or air sensors on the outdoor unit.

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I have a Mitsubishi heat pump that runs well but the outdoor unit does not defrost what could be the problem.


Why does my heat pump ice up in Winter?
Heat pumps naturally ice-up in the winter. It is normal for the entire coil to be covered in a white frost and even light ice, during cold weather conditions. However, it is bad for the entire unit to be encased in ice. This indicates ductless heat pump problems which should be addressed quickly to save energy and avoid serious damage to your ductless unit. These systems should periodically go into a defrost cycle. This keeps the unit running efficiently. If the coils are blocked by ice, proper heat transfer between the coil and the outside air will not occur.
How does the defrost mode work?
When the mini split heat pump goes into defrost, the reversing valve inside of the outdoor unit is energized, switching the system from heat to the air conditioning mode. The outdoor coil becomes the hot, the indoor coil becomes cold, and both - the outdoor and indoor fans shut off. This allows the outdoor coil to melt accumulated ice. When the built-in micro-computer analyzes that all ice have been melted, the heat pump heating system goes back to heating mode.
sanyo-mini-split-defrost.pngA cloud of water vapor may be seen rising over the outdoor unit and a "whoosh" sound can be heard as the refrigerant reverses direction. The entire process usually takes up to 10 minutes (depending on conditions).
How often does the system goes into defrost mode?
Ductless mini-split heat pumps have different ways of determining when to go into defrost. The built-in microcomputer determines outdoor temperature, refrigerant pressures, and several other factors. In colder temperatures the system will go into defrost more often than in warmer.
If a ductless mini split heat pump is severely iced-up in the winter it is possible that it isn't defrosting (though there could be many other causes). Let the manufacturer certified technician check your system

Oct 29, 2011 | Mitsubishi Mr. Slim MXZ30TN Air...

1 Answer

Indoor ac coils have ice build up and not cooling the house. can i melt it away with a hair dryer?


I have found that hot water cuts the ice better, my question to you, is why is the coil ice up?
Setting the temp to low below 72 degrees, a dirty air filter or coil, closed vents, I always have to ask is the outdoor coil clean?

Jul 12, 2011 | Heating & Cooling

1 Answer

I have a goodman self contained heat pump that is 3 and 1/2 years old. I wake in the night to hear what sounds like the fan runnning and running and running and air moving thru the vents. Then I will hear...


Heat pumps are a very efficient design when working properly. But lose efficiency the colder it gets outdoors. I usually tell people when it drops below freezing to turn the thermostat to aux or em. heat. A heat pump can remove heat from 20°f air. But not very well. More heat at 30°f air, obviously, and so on. So the colder it is outdoors, the longer it will operate to remove heat from outdoors. And then, if it can't keep up, it brings on the electric heat elements to compensate. Now you are running both outdoor and indoor heat. This is where it's inefficient and costly. Also, the outdoor will start to freeze up. This is normal unless you can see a substantial amount of ice. The heat pump will engage defrost mode, cycling on the electric heat indoors. And defrost mode is actually cooling mode! The reversing valve in the heat pump switches to cooling mode, cycles off the outdoor fan, and defrosts for a set time or temp. So now your electric heat is engaged, and your indoor coil is a COLD coil! Not hot! Very inefficient. These 2 things are why your elec bill is higher in the winter. So it makes sense to me, if the elec heat is going to be on anyway, to move the tstat to aux or em. heat, when it's going to be below freezing outdoors. This will turn off the heat pump and use elected heat only. The only down side to this is, if you don't have enough elec heat to keep you warm, you may need both heat pump and elec heat. So trial end error until you find what works. Also, have a qualified tech check the system for operation and efficiency. Hope this helps!

Apr 08, 2017 | Goodman PHKJ048-1 Air Conditioner

1 Answer

My Goodman GSC130361DE 60 Htz has problem with coils iceing up. Cleaned several times.


Hi, I am assuming you are talking about the indoor coil icing up when you are in cooling. The reason I am asking this as this appears to be a heat-pump and they will ice up in the winter at the outdoor unit. I will go with the indoor coil. If the indoor fan is blowing up to speed and you have cleaned the indoor coil but still have this ice forming, it could very well be that you are low on freon. This will also cause the suction line, the large copper line outdoors to ice and on into the indoor coil. This will happen if you have developed a leak some where. Also, make sure you have good strong return air coming back through the air filter, because if you have problems with the duct work like holes from varments, or you have had any repairman around the duct work, sometimes they will flatten it causing no air flow and you will have ice. My bet is you are low on gas. Shut the unit off to make sure it has no ice on the coil, and go to the outdoor unit. Have someone turn it to cooling and put your hand above the fan on the condenser coil. The air should start to get warm and then hot if the freon level is ok. This also depends on the outdoor temperatures. The hotter it is outdoors, the hotter the air will be. If it is rather cool, around lets say 75*F, and this copper suction line is starting to form ice, the problem is it is low on freon. In this case, this is something you will need to call a tech out to charge the unit. You have to be certified and be able to buy the right freon which is only available to a/c and refrigeration tech's. If this is a heat -pump, and it is winter where you are and the outdoor coil is icing up, let me know and I can go through the steps to check this out. I do believe this is a summer problem where you may be, but you never know unless you ask. Please don't forget to rate me on this post as I am sure you will be kind. I wish I could save you a tech call, but if its low and you have cleaned the indoor coils, and filter is clean, then this is the problem.
Sincerely,
Shastalaker7
A/C, Heating, & Refrigeration Contractor

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1 Answer

Have a large new house with lots of vinyl clad wood double hung windows on a lake temp today this am is 0 F we have a HRV system house temp is 66 downstairs and 58 upstairs heating with a heat pump and...


Really not efficent to run a heat pump at those temperatures. Below freezing is not good for the compressor in the outside unit. The humidity in the house with the low temp. is causing the condensation on the windows to freeze. Kinda like an air conditoner does in the summer without the freezing humid air from the house goes over the cold a/c coil and the moisture condensates on the coil running down to drain pan. raising the temp. in the house and lowering the humidity should help. I would also recommend running the electric heat in low outside teperatures.

Dec 17, 2009 | Aprilaire 600 Humidifier

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