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Originally Posted by Brianv512
I have a 66 Sovereign and I will probably have to replace the AC and the furnace. I have been thinking about using a heat pump and AC combo to save some money. I live in Michigan and plan on only camping in the summer and maybe fall. It seems that heat pumps are only effective for temps 40 degrees or higher. So here are my questions.
1. If a heat pump is on and the temp outside goes lower than 40 will it damage the unit or will it just be ineffective? I could always have space heaters as backups but I don't want to worry that it drops below 40 while sleeping.
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Their effectiveness gradually degrades as the temperature drops. Most have temperature sensors and won't try to run below 32 or so, but they won't be damaged by cold weather.
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2. Should I just get the biggest unit I can (15000 btu)? (30 foot trailer)
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Yes. I have two 13,500 btu units and the front one can't keep up with the cooling load on a hot sunny day.
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3. Do I want a ductless unit? I assume that means that it is one unit on the ceiling, condenser on the roof and fan on the ceiling inside.
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You do want a ductless unit although the fan is in the rooftop unit. The only thing inside is a sort of a shroud that covers the holes and more or less spreads the airflow out.
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4. What are the best manufacturers? Is there an issue with Carrier?
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My units are Dometic and while they work OK there have been some problems. I believe Carrier was in the process of discontinuing some models so that might be a consideration.
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Any other info would be appreciated. Thanks.
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I don't run the heat pumps because they are loud. Way loud. I've installed resistance heat instead which works better.
With resistance heat you can run 3000 watts with a 30a shore power connection, which is enough to heat a 30' trailer down to about 30 degrees outside temperature with no wind. In worse conditions the heat won't keep up.
In freezing conditions the plumbing and holding tanks, if in use, have to be heated. The gas furnace is, in the stock configuration, set up to do that. The heat pumps and resistance heat will not.