[Great68]

You're going to be looking at $15k on the low end to $25k on the upper end.

It all depends on size of unit, whether you need electrical upgrades, and difficulty of running refrig lines & wiring through the house.

Just for reference, my 3-ton central unit cost me $15K installed last year, replacing my old oil furnace. And that was "good buddy" pricing, basically cost + 10%, done by my buddy who's the commercial Project Manager for one of the larger refrig companies here on the island.
That also excluded any electrical work (Which I did myself, and already had 200A service in my house)

As for rebates, there are three major rebates available:
1. Clean BC Heat Pump Rebate - Up to $6k. This one is essentially through BC Hydro, and is simple to get. All you have to do is install you heat pump, submit your application, and submit receipts/proofs. (Just make sure the heat pump you install is an elligible model)

2. Canada Greener Homes Grant - Up to $5k for upgrades + $600 for the energy evaluations.
This is the federal grant, is a bit more convoluted in the process. This is the one where you must sign up, then do a pre-upgrade energy evaluation before install (Cost about $600), and a post-upgrade evaluation after install (Cost about $200).

3. Canada Oil to Heat Pump Affordability Grant - Up to $5k. This one is brand new for this year (I just missed it). Obviously only applies if you're upgrading from oil furnace.

There also may be top ups/rebates available through your municipality/district. I got an additional $350 from Saanich and $350 from the CRD.

One thing I will say though, don't count on getting the rebate money back quickly. It was about 4 months before I got the Clean BC rebate cheque, and 7 months before I got the Federal greener homes cheque.