We went to gulf shores last summer and dealt with the same thing. 2 - 15k units on a 36' class a, ran ALL day non stop, but at night you'd freeze. On the reflective bubble insulation, we just cut them a shade bigger than the window and they wedge in there quite nicely. All but one window in our MH is covered. Also insulated the AC return air box with the stuff, put on with spray adhesive. Makes the unit run more efficient. Our skylight is painted and insulated to block all light and heat there, plus all roof vents have MaxxAir II covers and pillow insulators. Ours will keep it at 70 deg in 100 deg weather now. One picture below of the AC return air box. You can see the skylight mod in my photo album.
John and Rebecca Dickson
Emma-7 / Little John-5 / Iva-1
Full Timing Again, Rev B
2013 Ford F-350 Lariat CC LB PSD
2015 SOB TT - With OC's Awning Poles (#8)
At least in Heaven, RVs will be perfect, and I won't have to keep fixing them.