My (oh my!) Mini Split Heat Pump Savings! They could be yours? :)

I just received confirmation that BC Hydro has received (by email) my application for their $800 Rebate for mini-split heat pump installs. Woot! Hopefully the cheque comes back soon. 🙂
(note the rebate is only available for mini-split not traditional heat pumps)
I could only apply for the Hydro rebate (there are a bunch!) because I got rid of my oil furnace 10 years ago when we moved into our home, but if you upgrade from an oil furnace you can apply for an extra $500 rebate from the City of Port Alberni!
The total cost was $8099.75 for the heat pump plus $163.67 for the electrical work so $8263.42 total.
It is a Fujitsu variable speed heat pump with one outdoor unit (pictured) and two indoor units.  AHRI Number 6998277.  Here is the system’s AHRI certificate.
I am super happy with the installation and the comfort level of the system compared to our electric baseboards. (or… way back when… the noisy, smelly, expensive and inefficient oil furnace!) We keep the house at a steady 20C.
The two indoor units, one larger one on the main floor and a smaller one in the basement have no trouble keeping the house (2500sqft, built 1940, EnerGuide rating 64+) warm. And both they and the outside unit are basically silent from inside the house!

We are also in the middle of replacing a roof/ceiling in our 2nd floor bathroom which means there is no insulation up there so lots of extra heat loss temporarily. (It’s chilly in there at night!).  Once that is insulated again I expect our savings to increase.

We turn the breakers off on our baseboard heaters through the summer and most of them have remained off except our two upstairs bedrooms, but those are turned down to 18C and haven’t come on yet, even with the bathroom work. 

By The Numbers

I ran some numbers comparing this time period (Oct 6-22) in 2015 and in 2016 and comparing, thanks to BC Hydro tracking average temperatures, with days of similar temperature.

I grouped days by their temperature and by year and then got an average temperature and KWh usage for that temperature for each year.

2016 is the comparable year: Average consumption since installing the system Oct 6 has been about 62% of last year: a range of between 48% and 74% of last year in kilowatt hours per day.
I used groups of temperature days at 8C, 9C, 10C, 11.5C, 12C and 12.5C… a total of about 26 days of comparison between the two years.  So differences in daily weather patterns are minimized.
If I am super conservative and take the low end savings, I get 25% off of last year’s power usage, that would be a saving on my November 2016 bill of 636kWh… all on the top tier of 12.43c/kWh which would have amounted to a savings of $79.08 on my November 2016 bill.  
If I go on the top end of the savings calculated I go as high as a 50% reduction in power usage, that would get me to 1272.5kWh less usage compared to last November’s bill which is within Tier 1. I would have saved $154.79 on that bill.

Last year was, by far, our most expensive and consumption rich year ever since moving into the house.  A combination of a very cold winter, and a family that is growing up and using more heat (kids having showers!) and finishing the basement, etc etc.

We use electricity exclusively for our energy/heating needs.  We paid a total BC Hydro bill last year between May 2016 and May 2017 of $2724.32.

A 25% savings on that would be:


A 50% savings on that would be:


per year.

Subtracting the $800 rebate, the cost of the Heat Pump would be paid for in 5 to 11 years.
I suspect that the savings will be somewhere in the middle of that range on a percentage basis, but it is of course difficult, if not impossible, to predict the monetary savings given annual weather and hydro rate variables.  It does seem certain that hydro rates will rise, and so with them, savings. A 5-10 year payoff seems quite likely and I’m OK with that. 🙂