It seems that this problem has appeared often during the past month or two. The unusually hot temperatures that many of you are experiencing is causing your A/C to work overtime or isn't keeping you cool enough. If you have run into this problem this summer, then you might find the following article (which I just came across) of interest.
"A problem often seen is the A/C isn't cooling. It's blowing but the air coming out is barely cool.
Most of the time, the problem is the unit is freezing up. Many people equate the use of an RV A/C with a residential A/C so they keep lowering the temperature setting to Cooler. This is almost the exact opposite of what they should be doing.
The roof A/C is a sealed system. When the compressor is running, it is under a great deal of pressure. In order to cool properly, the compressor must cycle on and off. If it is running constantly, it never shuts off so it never relieves the head pressure on the compressor. It then freezes up and when it does, it stops cooling.
After being off for an hour or so, it will again start cooling but wil just repeat the freezing up process if the thermostat is set to too low a temperature.
The first thing you need to understand is no RV A/C will keep the inside of an RV at 68 degrees in the midst of summer or on a hot day. The system simply can't do it and RV's are not insulated well enough to allow it to happen.
To get the most out of your A/C, never set the thermostat lower than 3/4 or 74 degrees. This will allow it to cycle on and off and will produce maximum cooling at this setting. You may be a tad warmer but overall you will end up being much cooler than you will by cranking the thermostat down. The coolest settings are not always the best settings in extreme temperatures.
You can maximize the effectiveness by: Closing all the shades, lower the awning, put alum reflective foil on your windows, and park, if possible in as much shade as you can." S. Franklin
I thought I would share this article with you --- now that summer is over
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Hope you find it useful --- for next year.
PS I am assuming that the author is referring to a single, standard BTU A/C.