I have recently purchased a 1975 singlewide mobile home (2x4
construction with aluminum panel siding). The unit has a Coleman
electric furnace (no heat pump), storm windows and rather minimal
insulation throughout. I am trying to decide what improvements
(if any) would be justified. The trailer is located in the
Seattle area where temperatures rarely get below the high 20's
and air conditioning is considered to be a (rarely necessary)
luxury.

A heat pump is probably out of the question due to cost.

I am considering re-insulating the floor, removing the original
"rodent barrier" and R-7 (more/less) insulation, replacing same
with R-19 stuffed between joists plus duct insulation, etc. I've
figured the cost of materials at around $400.

I've also been told (but haven't confirmed) that it would be
possible to add "blown in" insulation to the ceiling for around
$300. I haven't determined the current insulation up there, but
it is probably R-13 or R-19.

I'm planning to replace both doors (hollow core) with current
R-5 (or better) models.

I have also thought about looking at a NEW electric furnace/air
handler. However, I've received mixed reviews as to whether newer
units are really any more efficient than the originals. (However,
a new one would likely be QUIETER.)

I would greatly appreciate comments on these issues or any other
suggestions that might yield improvement. Do-it-yourself
approaches are most likely to be implemented. grin

Thanks!

MTW