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07-15-2020, 01:44 PM
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#1
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Junior Member
Join Date: Mar 2019
Posts: 7
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A/C will not keep up
How effective is foil in the windows to keep a coach cool during 90+ degree days?
I have a 2002 Jayco Avatar with a heat pump/AC unit and it will not creep the house cool.
It’s gets 90 + degrees in side
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07-15-2020, 02:03 PM
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#2
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Registered User
Ford Super Duty Owner
Join Date: Nov 2014
Location: NW Ohio
Posts: 7,114
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Welcome to the forum. Yes, it will help, A LOT.
On my ole Mirada, I did a couple things. This allowed the single 13k BTU A/C unit to keep the inside cool even in 115deg Phoenix heat.
- I tinted the windows, BIG HELP.
- Plug all openings, i.e. the roof vents let in a lot of heat, even when closed.
- I have a roof skylight in the bath. I painted the outside white. It still let in some light, but BIG difference in letting in heat.
- I made reflectors for the windshield with silvered bubble wrap insulating material.
- I made a modification to the A/C ceiling unit to enhance the air flow.
Here are a couple links to the articles I wrote:
Window tint and window covers – 2001 Coachmen Mirada 300QB
Beat the heat – Improving air flow from the air conditioner ceiling unit – 2001 Coachmen Mirada 300QB
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07-15-2020, 02:07 PM
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#3
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Community Moderator
Monaco Owners Club
Join Date: Jul 2016
Location: Central, Arkansas
Posts: 11,223
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Make sure the coils on your ac unit/s are clean. You will need it work at maximum performance. Putting the foil on the outside of the rig will work better than putting it on the inside. Lastly if possible park facing north so the sun heats the front drivers area as little as possible. The windshield is the biggest culprit of excessive heat in the summertime.
__________________
2004 Beaver Monterey Laguna IV
Cummins ISC 350HP Allison 3000 6 speed
2020 Chevy Equinox Premier 2.0t 9 speed AWD
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07-15-2020, 02:28 PM
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#4
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Junior Member
Join Date: Mar 2019
Posts: 7
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Quote:
Originally Posted by Spdracr39
Make sure the coils on your ac unit/s are clean. You will need it work at maximum performance. Putting the foil on the outside of the rig will work better than putting it on the inside. Lastly if possible park facing north so the sun heats the front drivers area as little as possible. The windshield is the biggest culprit of excessive heat in the summertime.
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I have the black windows on all windows except the windshield, and driver/passenger side windows.
My AC guy says the coach AC unit is running as it should but says it will not keep up with the btu increase in the hot weather.
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07-15-2020, 02:30 PM
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#5
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Senior Member
Join Date: Aug 2008
Location: Georgia
Posts: 8,638
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Quote:
Originally Posted by bootgar
How effective is foil in the windows to keep a coach cool during 90+ degree days?
I have a 2002 Jayco Avatar with a heat pump/AC unit and it will not creep the house cool.
It’s gets 90 + degrees in side
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I am assuming you have 2 units and both are running. Are they running properly, is the air cool? I think the windshield is the biggest problem cover outside with sun screen.
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2007 Fleetwood Revolution LE 40V
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07-15-2020, 04:07 PM
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#6
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Senior Member
National RV Owners Club
Join Date: Jun 2010
Posts: 4,581
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On my RV I have to start the AC unit before it gets warm inside - often that means running it all night.
__________________
Bob & Sandi, dogs Tasha a Frenchie and Tiki a Skipperkey
SW OREGON 2005 34 foot DolphinLX
If towing: a bright red 2016 Mini Cooper on a tow dolly.
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07-15-2020, 04:52 PM
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#7
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Senior Member
Monaco Owners Club
Join Date: Jun 2011
Location: CA
Posts: 4,456
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pull your slides in during the day. You can also hang a curtain across the width of coach behind the drivers seat. The front windshield is a big heat gain. If you're parked pointed north, it will help. A windshield cover on the outside is helpful (something like magna shades)
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Bill & Brigitte
06 Windsor PEQ, Cummins 400 ISL
2014 Honda CRV or 2012 Jeep
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07-15-2020, 06:14 PM
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#8
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Senior Member
Join Date: May 2017
Location: Vancouver Wash
Posts: 7,227
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Line all your upper cabinets with Reflectix............i'm in 102 weather today, and 22 degrees cooler in here using a 13,500 A/C
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07-16-2020, 08:29 AM
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#9
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Senior Member
Join Date: May 2010
Location: Detroit, MI
Posts: 142
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I didn't want to cover my interior in bubble wrap, but I also didn't like the 85° inside after the A/C had been running all day.
Try this to reduce your output air temp. It costs nothing but 10 minutes of your time.
https://www.thorforums.com/forums/f2...ice-12980.html
Knocking 10-15° off the cold air temp makes a huge difference.
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07-16-2020, 10:57 AM
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#10
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Senior Member
Join Date: Jan 2018
Location: Capistrano Beach, California
Posts: 4,465
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A properly cooling A/C will show around 16-22 degree differential between incoming air and outflow. Add to that the volume of air in the coach that must be cooled by circulating through the A/C, plus the fact that air is constantly being heated, and you can see why it's difficult for it to keep up, especially if the A/C is started after the ambient/inside air is already hot.
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Larry, Eileen, and Finley
2004 Alpine 36FDDS
Third motor home, first Alpine, no need for another.
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07-17-2020, 10:09 AM
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#11
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Senior Member/RVM #90
Monaco Owners Club
Join Date: Nov 2002
Location: Columbus, MS
Posts: 54,622
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Hi ! Welcome to IRV2! We're sure glad you joined us!
The Reflectix insulated foil that you can buy at Lowes,Home Depot or Camping World is very effective over the windows to keep the heat out. I bought a roll of it that is 48" wide and cut a piece to place inside the windshield when parked. It does a great job!
Good luck, happy trails, and God bless!
__________________
Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD
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07-17-2020, 10:48 AM
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#12
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Registered User
Holiday Rambler Owners Club
Join Date: Nov 2013
Posts: 215
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Best things you can do...park in a shady spot. If you can't then you need to create as much as possible. Awnings over windows, slide toppers and exterior black screen mesh window coverings over windows that can't be covered by an awning or other shade producing device. Black is more efficient than lighter colored mesh coverings.
Using the reflective bubble wrap will help but it has consequences too. Such as superheating your glass and the rubber gasket material that holds it in place. This causes deterioration and expedites dry rotting of said material.
RV A/C units are only designed to keep the ambient air temp inside about 10-15 degrees cooler than what is outside. Give the A/C as much lead time as possible to beat the heat. Set them to the desired temp and turn them on as early as you can. Instead of turning them colder as the heat builds, raise the temp selected up a degree or two during the hottest part of the day. Remember it will not cool much below the ten degrees cooler than the outside temp.
You can increase your rigs insulation efficiency by using that reflective bubble wrap to line the inside of the back wall of the cabinets. Insert those vent pillows in the vents and apply a reflective film to the other transparent blisters such as those over the shower to lower the amount of radiant energy that penetrates.
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