looking for a motorhome for primary residence

I just started looking at class A motorhomes for use as primary residence. My plan is to park it in Taos Ski Valley Nm as this is where i have lived and worked for 22 years. I've been scouring craigs list looking at used MH's in the 4k to 8k range. Mostly late 90's models. Everyone boasts great a/c but no one talks about the furnaces or warmth/insulation. Any suggestions for what brands/models I should be looking at? I figure for my purposes, something around 30 to 36 feet should do well. I know this is vague but any help to point me in the right direction is appreciated. im first time buyer. I read the sticky for first time buyers. Its great info but its a bit beyond what i can afford, i.e. beggars cant be choosers.

thanks a bunch :)