It sounds to me that you need some cool side ventilation. Mine have a solid top with sliding glass doors and in the summer I slide the doors open somewhat and put a piece of a shelf in to vent the cool side more, otherwise it would be too hot like yours. I'm attached a pic. so you can see. Since yours is made of wood maybe your dad could cut a hole on the cool side and then install something like a heat vent cover.

Tough to say on the 86 thing. I'd be unhappy with that but it may be the best you can get. If you don't A/C and the room temp. is high seventies or low eighties then you'll never get it down to 81ish.

Since your enclosure is 30" tall I'd install a 4' fluorescent fixture inside on the back wall 20" or so up from the substrate and use a Zoo Med Reptisun 10.0. A 4' fluorescent is only 40 watt so you will save over the 160 watt MVB and it will give overall better lighting to your whole cage. Sounds like right now there is no lighting on the cool side. Then you can use a regular flood light bulb to provide hot side temps.

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