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rooftop air conditioner recommendations wanted

Question:

There are some strict requirements however.  Our current 2 year old roof ac is a duo-therm brisk air that has the problem that the thermostat will not kick in below about 68 degrees.  It’s probably living up to it’s specs,

  Correct We don’t need a big compressor because of the small size of the RV, but we do need a thermostat with settings more suited to us.  Do you know of a rooftop brand whose thermostat will allow it to keep cooling in the lower 60s?  

  Nope. You must feel you have a need for cooling at these temps, but I fail to see why. It could be that older units did allow cooling at these temps, but I am not aware of any units that will cool that low. — RV and Camping FAQ http://kendaco.telebyte.com/rlindber/rv   If Windows is the answer I would really like to know what the question is

Response:

Need a recommendation for a roof top air conditioner for a small Class C (19 foot ‘78 Chinook). There are some strict requirements however.  Our current 2 year old roof ac is a duo-therm brisk air that has the problem that the thermostat will not kick in below about 68 degrees.  It’s probably living up to it’s specs, for the installation manual (which I didn’t read before purchase as it was emergency replacement air conditioner) states that thermostat only operates in the range from 65 to 90, and there are no hidden adjustments we can find to change this lower end. We don’t need a big compressor because of the small size of the RV, but we do need a thermostat with settings more suited to us.  Do you know of a rooftop brand whose thermostat will allow it to keep cooling in the lower 60s?   It also should be low enough in power requirements that it will work when we are plugged into only a 15 amp line, as most of our favorite campsites are limited to that.

Response:

Need a recommendation for a roof top air conditioner for a small Class C (19 foot ‘78 Chinook). There are some strict requirements however.  Our current 2 year old roof ac is a duo-therm brisk air that has the problem that the thermostat will not kick in below about 68 degrees.  It’s probably living up to it’s specs, for the installation manual (which I didn’t read before purchase as it was emergency replacement air conditioner) states that thermostat only operates in the range from 65 to 90, and there are no hidden adjustments we can find to change this lower end.

<<..         Look closer- there will be an adjustment on the thermostat (a set screw in the side). All of the thermostats are basically the same no matter which manufacturer makes the whole unit- so don’t throw out a two year old unit.         There are after market "remote controls" that will give you a wall mount thermostat.         For new- I really like Carrier- but their thermostat is likely set the same (unless you go with a wall mount thermostat.) — Chris Bryant On RVing- TV about RVs, by RVers http://www.onrving.com  

Response:

I recently installed 2 of the Coleman power saver units on my motorhome.  I’m very happy with the performance, and they are rated at only 10.2 amps on hi.  I installed a stick thermometer in the vent and it has ran down to 50 deg. output air.  It runs at a 20 deg. split all day long.  It is a 13,500 BTU unit.  I bought them at Camping world.  For pictures of them installed check out my web site at http://www.austintec.net/rv  See ya  Slider – Hide quoted text — Show quoted text – Need a recommendation for a roof top air conditioner for a small Class C (19 foot ‘78 Chinook). There are some strict requirements however.  Our current 2 year old roof ac is a duo-therm brisk air that has the problem that the thermostat will not kick in below about 68 degrees.  It’s probably living up to it’s specs, for the installation manual (which I didn’t read before purchase as it was emergency replacement air conditioner) states that thermostat only operates in the range from 65 to 90, and there are no hidden adjustments we can find to change this lower end. We don’t need a big compressor because of the small size of the RV, but we do need a thermostat with settings more suited to us.  Do you know of a rooftop brand whose thermostat will allow it to keep cooling in the lower 60s? It also should be low enough in power requirements that it will work when we are plugged into only a 15 amp line, as most of our favorite campsites are limited to that.

Response:

- Hide quoted text — Show quoted text – Need a recommendation for a roof top air conditioner for a small Class C (19 foot ‘78 Chinook). There are some strict requirements however.  Our current 2 year old roof ac is a duo-therm brisk air that has the problem that the thermostat will not kick in below about 68 degrees.  It’s probably living up to it’s specs, for the installation manual (which I didn’t read before purchase as it was emergency replacement air conditioner) states that thermostat only operates in the range from 65 to 90, and there are no hidden adjustments we can find to change this lower end. We don’t need a big compressor because of the small size of the RV, but we do need a thermostat with settings more suited to us.  Do you know of a rooftop brand whose thermostat will allow it to keep cooling in the lower 60s?

A couple of solutions other than replacing the AC. One, I wrote a fairly long article a couple of months ago on converting the rooftop AC to wall thermostat control.  You might want to go back to Deja and find it. Alternative solution: The thermostat on my Coleman roof unit DOES have a calibration adjustment.  It is recessed into the thermostat unit next to the control shaft.  It must be dismounted to access. This adjustment has enough bite to adjust down to where the evap freezes.  Since most of these thermostats are alike in physical shape, you could simply buy a Coleman replacement thermostat and install it. Hate to ask a "Duh" question, but did you look closely at the existing thermostat, including dismounting it?  Would be quite surprised to learn that it really doesn’t have a calibration adjustment.  Most window-unit type thermostats (which is what we have in our rigs) do. It also should be low enough in power requirements that it will work when we are plugged into only a 15 amp line, as most of our favorite campsites are limited to that.

My 15k BTU high efficiency coleman runs in all but the hottest weather on 15 amp service.  Tight but do-able. John — John De Armond http://personal.bellsouth.net/~johngd/ Neon John’s Custom Neon Cleveland, TN "Bendin’ Glass ‘n Passin’ Gas"

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