As mentioned in another thread I am thinking about converting from my current oil fired boiler using basboard rads over to a HP solution. I originally started out looking for a solution to keep my existing system rads and use a air to water HP with my current boiler as back-up however I cannot find any local contractor in my location that seems to know of a system that will work well. Some say it just wont work, some say it might if I change all my rads to LT. This uncertainty is making me doubt wheather or not I am going down the right road with this conversion. Also, I have come to realize that changing the rads is going to be just as much trouble as running all new ductwork and going with a air to air HP.
So based on the below what size ATA HP and accessories will I need to heat my home . Our house is 10 years old and is built well. It is 3600 sq ft (1800 1st level & 1800 in basement), walls insulated with regular bat insulation, attic blown in with R40 (to be topped up soon after 10 years settling). Basement finished with 2" high density foam on the outside with framed walls inside insulated with regular insulation as well. Windows are Jeld Wen single hung, not sure about the doors but they are of good quality.
My location is Newfoundland Canada and in this area winter temps usually hover around 0 deg C but sometimes drop to as cold as -10 deg C......but this is rare. Inside temps we usually like to be around 22 deg C in main living spaces with it a little cooler in the bedrooms.
I know it is recommended to get a heat load calc done but in my area this is pretty much unheard of. All I am lookinf for hear is as much information as I can get to educate myself so i know if a contractor is promoting a solution that will work. This is going to be a huge investment for us so I want a system that will work at a reasonable price. The current system I have works but it is expensive to run and heating oil seems to be going nowhere but up.
Also, i would like recommendations on brands as well. The contractors around my area seem to promote Mitsubishi however I hear Diakin are good as well. I have done some reading on the Mitsubishi Zuba but it only comes in 3 tonne, i think it will be too small......thoughts.
Anyway, sorry for being long winded but I am looking for some expert advise and it seems this forum has it.