OK got a question for anyone who has a 40 plus foot toy haulers and specifically the Grand Designs Momentum 395 and uses them in extremely hot climates. I work and stay for long periods in West Tx. I currently stay in a travel trailer but really want to upgrade(and got approval from the wife). Want one of these to use all of it as living space. My main concern is how they perform this function in the hot climate. I understand that only 2 ac's can be on at a time but is the insulation up to this. Any help will always be appreciated.

We full-time in a Grand Design Momentum 385TH which has a similar design. Keep in mind that on 50A service you can run all 3 AC units (if it has three) at the same time. That being said, we generally only use all 3 if we are setting up and wanting to rapidly cool things down or when everything was shut off for the day - and it does cool things down fast. We really got the 3rd mostly for backup in case either of the other 2 fail. They are well insulated, and two do the job just fine for us,

I used to have a 2011 Cyclone 370C. Not the most insulated camper but it did "fair". We now have a 2015 Vengeance. Its amazing how much better insulated it is. Maybe its the manufacturer but for the most part, I think its just using better materials these days. GDs are going to be just as good or better than most. Yes, its going to be hot. They're certainly not a house. But they should be pretty well. If GD offers a particular package for extreme temps, obviously get it. But like ramgunner said, 3 ACs help a ton. We also take at least one or two fans. Keeping the air moving around makes a nice difference.

ramgunner wrote:Keep in mind that on 50A service you can run all 3 AC units (if it has three) at the same time.That's interesting. Our unit (different brand) has a toggle switch to swap between the front bedroom and garage ACs, so it's impossible to run them both at the same time.

We have a GD 380TH which is the same size as the 385. I also can run all 3 AC's on 50 amps. The insulation is adequate in the living area and bedroom, but because of the large windows in the garage and the back ramp, it tends to stay a little warmer. If I was going to spend time in hot climates and use the garage area for living space, I'd probably put the reflective insulation on the windows to reduce some of the heat. With that said, we are in 90 degree days right now in AZ and we are comfortable.

My Vengeance will run all three. But the one in the bedroom and the one in the garage are the 13,500 btu units so I'm sure that helps keeping it from tripping the breaker.

Momentum 395 Hot Weather Question | Good Sam Community

lawnspecialties
Explorer
Mar 14, 2017
I used to have a 2011 Cyclone 370C. Not the most insulated camper but it did "fair". We now have a 2015 Vengeance. Its amazing how much better insulated it is. Maybe its the manufacturer but for the most part, I think its just using better materials these days.

GDs are going to be just as good or better than most. Yes, its going to be hot. They're certainly not a house. But they should be pretty well. If GD offers a particular package for extreme temps, obviously get it. But like ramgunner said, 3 ACs help a ton.

We also take at least one or two fans. Keeping the air moving around makes a nice difference.
ramgunner
Explorer
Mar 14, 2017
We full-time in a Grand Design Momentum 385TH which has a similar design.

Keep in mind that on 50A service you can run all 3 AC units (if it has three) at the same time. That being said, we generally only use all 3 if we are setting up and wanting to rapidly cool things down or when everything was shut off for the day - and it does cool things down fast. We really got the 3rd mostly for backup in case either of the other 2 fail.

They are well insulated, and two do the job just fine for us,

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