Hello @ Connor Umfleet,
Wow, you have made some great moves so far with your house hacking! Congrats!
One way to evaluate if it is a good financial decision is to see what you clear from your rentals and apply that money toward extra principal payments at your new Dundee house. I am assuming that the $6,000 a month mortgage is feasible.
I don't know if BP has an early payoff calculator for mortgages, so I used the one at bankrate.com, and the numbers you provided in your post. Approximate monthly funds to pay additional principal on the loan $3,065. You will have the New Dundee home paid off 100% in 12 years. That would save over $760,000 on the life of your loan and alleviates your concern of the higher interest without having to rely on refinancing. It is possible that rates may drop, and you can refinance at some point as well.
Of course, you also get the additional enjoyment of being happier in the new house. That I cannot qualify for you in dollars. :)
Here is how I arrived estimated extra monthly mortgage principal payment amount.
Vancouver house: $275 a month = $475 monthly take home after paying the mortgage and planning for maintenance expenses of $200 a month. (You might go several months without maintenance issues, but if a plumbing issue comes up, that could be an $800 bill, and maybe something else in the year.)
Dundee House: $1,165 a month. = $1,815 take home after paying the mortgage. You will have more expenses at your short-term rental than your long-term rental. You will still be paying all of the utilities ($350 to $400 a month). For other expenses, I will use my Airbnb I end up replacing sheets a couple of times a year, replacement dishes (one set every year or two due to breakage), extra cleaning fees not covered by the guests or Airbnb's host guarantee, regular supply of consumables (shampoo, toilet paper, paper towels, dish soap, laundry soap, etc. Let's say those items amount to $250 a month.
Any months you don't have a maintenance expense, stash away the money until you have a reserve account for your rentals of about $30,000. That way you will have money to address big ticket items in the future as they come up such as roof, repainting, etc.
New Dundee House $1,625 a month
$2,000 a month for short term rental, less $250 a month towards utilities, less $125 a month for replacing consumables, and miscellaneous expenses that come up.
There are lots of ways for you to see if this makes sense for you, and I hope this is a good starting point!
Cheers,
Melissa