Ive been looking at the Englander 28-3500 as a solution for my home. I dont currently have ductwork and really dont have the money to install it right now either. I have heard different people say that round 8" duct with 6" flex duct runs to registers would work and be simple to install. My house is small with an unfinished basement. Is this correct info or do I need an HVAC person to come install a full blown duct system?