I have a ranch-style house built in the 1960's that doesn't have an attic, and has no roof insulation. It's tongue-in-grove wood, then a 3/4 inch felt pad, then decking, then shingles. (Our house is essentially a picnic shelter, with exterior and interior walls.) Unfortunately, our heating/cooling bills are very high. We have replaced the original windows with nice Pellas, but I'm confident that our ceiling/roof is the reason our house can't be cooled in the summer, and can't be warmed in the winter. Any suggestions on repair/replace? We live in WV, and need help ASAP. Thanks in advance.