I have a sunroom studio on the back of our California home. I am using it as a studio and will need heat this winter. It never gets much below freezing so I don't need a lot of heat. As you have heard electicity rates out here are out-ragious:mad: . My question is how do I know which heater to get and will an unvented propane heater let off smells and poisons? I prefer not to use kerosene. Thanks.....

I'm going to be installing a forced air propane furnace in an existing large, two story house, and need general information on laying out, sizing and installing supply and return ductwork. There is no ductwork, so I'll be starting from scratch. I've read everything I can find, which hasn't been much! I saw a reference here to a post by Lynn Comstock, but haven't been able to locate it. Could anyone recommend a book or website that covers some of the general rules? I have a few options for running branches for the upstairs. All 1st floor rooms but one have dropped ceilings, and there's plenty of space for ductwork between, so I'll have a good bit of flexibility once I get that far. Is it better to run two large branches off the extended plenum, then run small lines from them, or should I try to run more smaller branches with less duct running from each? I've read that both 90 degree turns and flexible duct inhibit airflow. Does the same thing apply to semi-rigid? Using semi-rigid duct instead of tees or elbows could eliminate a couple 90 degree turns. Can metal ductwork and semi-rigid be used together? Could someone recommend a distributor online that shows or lists most of the elbows, etc. available? Are Y's, 45 degree and flexible elbows available in most round duct sizes? Should the cfm of a branch equal the combined cfm of any lines running from it? Should the extended plenum's cfm equal that of combined branches? Should the return air inlets be equal to supply outlets? If so, must this balance be achieved for each room individually? Any help or information will really be appreciated. Thanks.