I'm getting ready to buy a 1988 Norris Parkland model 24x60(?) manufactured home for $18k. The home isn't really in need of much work but I want to make it my own so I'm going to gut it and start new. What I'm curious about though is since all the ceilings are vaulted would I save any on my heating / cooling cost by reinsulating and making the ceiling flat to add more space above. I'd also be installing a ridge vent and maybe some large gable vents to allow air to flow through the 'attic'. I will also fur the walls out to 2x6 to allow for R21 insulation instead of R19.
The current homeowner say's they are spending about $300 a month in utility bill and when I went over there she had a/c set at 74 and it felt like 88. I know the a-coil is probably partially to blame because of restricted air flow but if I'm going to be gutting it I'd like to do whatever I can to make it as efficient as possible. Is my thought process correct? This will be in Illinois.
And if this is considered a DIY post then my apologies.
Also, would adding a return vent across the other side of the house help? The only return is the furnace door itself.