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Old 11-13-2013, 05:01 PM   #1
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HVAC Temperature Question

My Dolphin has the basement HVAC. Does anyone know the lowest heat temperature setting for this type of unit? We are still using for weekends so didn’t want to winterize right now. This evening when I set the main thermostat to 50 the gas heat clicked on which happens automatically when there is more than a 3 degree difference. I would like to use the electric heat rather than fuel by keeping the furnace on a low setting so I don’t have to worry unless we are getting a huge drop in temperature. Anyone know what that number is?
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Old 11-13-2013, 05:36 PM   #2
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The thermostat is the 'brains' of the HVAC system, so what ever it's lowest setting is is the limit of the system. If it goes down to 45º, then the heat won't come on until the temp drops below 45º and should shut off when the temp reaches 45º.
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Old 11-17-2013, 05:11 PM   #3
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I read or was told a long time ago to not use the heat side below about 35 degrees because the condenser will freeze and that isn't a good thing!
The condenser runs about 20 degrees cooler than the ambient temperature.
If I am wrong, somebody please comment.
Our thermostat allows us to select the HVAC units (on the Roof) or the propane furnaces.
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Old 11-17-2013, 05:23 PM   #4
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Quote:
Originally Posted by MikeandRuth View Post
I read or was told a long time ago to not use the heat side below about 35 degrees because the condenser will freeze and that isn't a good thing!
The condenser runs about 20 degrees cooler than the ambient temperature.
If I am wrong, somebody please comment.
Our thermostat allows us to select the HVAC units (on the Roof) or the propane furnaces.
Mike
If you are talking about a heat pump, I don't think it's a problem of the condenser freezing, it's just that it loses it's ability to create heat much below 40º. If you have heat coils in the A/C system, then you can get heat from electricity. Be aware that your roof top heat pump only will warm the air in the RV, it won't put any heat into the wet bay. The gas furnace probably has a duct that blows into the area, but the roof top heat pump or heat coils won't.
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Old 11-17-2013, 06:08 PM   #5
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As MikeandRuth mentioned, the outside condenser, in heat pump mode, runs quite a
bit colder than the outside air temperature. If the outside air temperature is cool and
humidity is high it will frost up, which is detected by the heat pump. The heat pump
function will stop and the gas furnace will kick in. I have run ours at a low temp. setting, in the 40's I believe, but it was unpredictable if it would stay in heat pump mode depending on humidity and outside air temp and condenser frost. This won't harm the unit. Our residential unit in our home frosts up many times a day in cooler
weather , but it will go into a defrost mode for a few minutes it clear it off, then continues to operate. Our RV heat pump doesn't have a defrost mode.
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Old 11-17-2013, 06:31 PM   #6
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Quote:
Originally Posted by MikeandRuth View Post
I read or was told a long time ago to not use the heat side below about 35 degrees because the condenser will freeze and that isn't a good thing!
Quote:
Originally Posted by BFlinn181 View Post
If you are talking about a heat pump, I don't think it's a problem of the condenser freezing, it's just that it loses it's ability to create heat much below 40º. If you have heat coils in the A/C system, then you can get heat from electricity. Be aware that your roof top heat pump only will warm the air in the RV, it won't put any heat into the wet bay. The gas furnace probably has a duct that blows into the area, but the roof top heat pump or heat coils won't.
The issue is that the outside coils do freeze up below ~40*F. The new Dometic roof systems defrost. Below 32*F the furnace kicks on.

To the OP, it depends on what basement unit and thermostat you have.
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