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2007 inspire 360 heat pump not blowing hot

Hello. New member
I have recently purchased this 2007 inspire 360 and we are on our second and longest trip. We have been in the same location in this RV for the past two months. It is getting very cold where we are. My unit has the hydro hot system. When I ran my roof top system originally it blow hot air and were able to warm the inside nicely but it was too loud. I then switched the control to Gas option instead of electric as to get more quiet.  Then I noticed I’m getting a lot of condensation inside the Rv and two small dehumidifiers are not doing the job. I’m trying to switch back to the rooftop units to see if that would help the condensation but now I get no hot air out of the ceiling grills.
Any ideas as to what I’m doing wrong?

Thank you
Dave

Re: 2007 inspire 360 heat pump not blowing hot

Reply #1 –
Your rooftop air conditioners/heat pumps don't have a diesel or propane option, they always run on electricity. They can indeed be loud and won't run at all below about 36 degrees outside temperature. When you turned on your "gas" option I'm assuming you actually turned on the diesel burner on your hydro hot hydronic heating system. That diesel burner exhausts to the outside while it heats up the fluid that circulates through your heat exchangers and that system shouldn't add to your interior humidity. I'm wondering if the condensation you're dealing with is really a separate issue. It's normal in winter conditions to see condensation build up from the combination of living in a small enclosed (limited fresh air) space (adding humidity to the air) and low outside temperatures causing that humidity to condense on cold walls and windows. Many RVers staying in those kinds of conditions for a longer period of time find they need larger humidifiers and/or they take actions to vent their RV occasionally and thereby lower their interior humidity.

On my coach, when the rooftop heat pumps refuse to run because the outside temps have dropped too low, the system automatically switches to my hydronic heater (although then I need to manually turn on the diesel burner or at least it's electric heating element).
-Dave
03 Allure 36 - 30897

Re: 2007 inspire 360 heat pump not blowing hot

Reply #2 –
Old HVAC guy here....HP's suck for heating. output rating is the same as cooling so a 18k bth HP gives 18kbtu heating at 47*.
and the colder it gets the worse it is. At 30* you now have 12k btu's. At 20* you have 10k, at 10* 8k...etc.
Now as it gets cold the coil will start to ice up. So it will go into defrost and reverse the flow of freon and blow cold air into the coach... colder it gets more often and longer the defrost cycles are. If the units had elect heat strips...and some have the ability to add them, the heat strips will go on when its in defrost. So you still get warm air but now at 2x's the amp draw. Better to have the heat strips come on at 35-40* and lock out the compressor. That way you get heat with no defrost.

IMO use elect floor heat if you have it and elect stand alone heaters if plugged in or floor and the diesel heater system if it gets COLD.
2004 Magna 42' 3 slide Chalet CC#6315M
C-15, 515HP 1650tq.