Overstock.com has a great 300 dollar memory foam mattress. It is a generic tempurpedic. 8 inch think and is a short queen size...my wife and I are currently on our maiden voyage with our 318... This will be night number 6 on that mattress and we love it....
Can't help with the furnace...we have the ac running not
We did notice a dent in our counter top...and a few other minor things that I am sure the dealer will take care off...so far we love it though...
2015 Dodge 2500 Big Horn 4x4 6.4 HEMI
2015 Grand Designs Reflections 323 BHS
Reese 16K Quick Slide with Factory Rail Kit Option