I moved into a house about 2.5 years ago, and the previous owners had a heat pump installed, together with a gas furnace. Recently I had my furnace repaired (faulty igniter) and the HVAC technician said the installation was done against code because the heat pump was connected to the return air pipe, instead of on top of the furnace. He said I could be "red tagged" with a B-type warning and be required to fix this within 45 days.
Is that true? Why would they have installed it into the return air pipe if that's against code? are there health risks with this? I use the heat pump (hot mode) when it's between 0 to 15 degrees C outside, just the furnace when it is below 0, and the cold mode heat pump when it's above 35 C.
What are my alternatives for fixing this? Can a contractor just fix the pipe to go to the right place?
I am located in Toronto, Canada.