Airxcel seems to take forever to cool park model

[woodland_park]

I have an Airxcel model 46413-812, that's mounted under my park model, that's always seemed to take a long time to cool our 500 sq ft park model. It's a 13,500 BTU unit, so it's plenty big..The park model has skirting all the way around the unit and the skirting is vented with 3 - 2' x 3' screens to allow airflow under the unit.There is no debris in the coil and the inside air return is clean. The airflow out the 4 vents seems very weak to me. It's 7 years old. I don't believe there's a high or low speed fan connection by looking at the diagram. The other day it was 91 degrees here and the A/C unit ran for 5+ hours before it turned off at 77 degrees.
Thanks for any comments

[Chris_Bryant]

Our 12x40 Park Model has a 2 ton unit- ~24,000 btu, so I don't think you have enough capacity for that trailer.

[wildtoad]

not sure you have a problem or not. If your home was sitting idle in 91 degree heat before cranking up the AC it's going to take a long time to drop the temp to 77 especially with a single 13.5 BTU unit. Everything in the unit will need to cool down. Walls, furniture, appliances all retain heat. If you can test the air temp at a return duct and at a vent. If the air going into the return is 90 and the air coming out is near 70 then then AC unit is doing a decent job. But, pumping 70 degree air into a 90 degree house will take a long time to cool especially in the direct sun. If the AC unit keeps things nice after the initial cool down then don't worry about it.

[kerrlakeRoo]

woodland park wrote:
I have an Airxcel model 46413-812, that's mounted under my park model, that's always seemed to take a long time to cool our 500 sq ft park model. It's a 13,500 BTU unit, so it's plenty big..The park model has skirting all the way around the unit and the skirting is vented with 3 - 2' x 3' screens to allow airflow under the unit.There is no debris in the coil and the inside air return is clean. The airflow out the 4 vents seems very weak to me. It's 7 years old. I don't believe there's a high or low speed fan connection by looking at the diagram. The other day it was 91 degrees here and the A/C unit ran for 5+ hours before it turned off at 77 degrees.
Thanks for any comments

I'm not sure I would call a 13,500 btu unit plenty big for a 500 sqft park unit.
at an average of 10' wide that means your dealing with a 50' long trailer.
If you look at most rv's anything over 35' long usually gets a second AC unit and always gets a 15,000 btu primary.
Remember most rv's have thin walls, and much less insulation than a sticks and bricks house, so the AC requirements will be higher than a comparable sized house.

[SoundGuy]

woodland park wrote:
I have an Airxcel model 46413-812, that's mounted under my park model, that's always seemed to take a long time to cool our 500 sq ft park model. It's a 13,500 BTU unit, so it's plenty big..The park model has skirting all the way around the unit and the skirting is vented with 3 - 2' x 3' screens to allow airflow under the unit.There is no debris in the coil and the inside air return is clean. The airflow out the 4 vents seems very weak to me. It's 7 years old. I don't believe there's a high or low speed fan connection by looking at the diagram. The other day it was 91 degrees here and the A/C unit ran for 5+ hours before it turned off at 77 degrees.

"Plenty big"? - for 500 sq ft?? Those owning travel trailers in the 30'+ range, which is half your square footage, will often start thinking about adding a second A/C for sufficient cooling. 'Though yours is a basement model it's hard to believe it's any more capable than a conventional 13,500 BTU roof mount unit and if so I'd say your expectations of this unit are unreasonable.