How to Choose the Right Heat Pump for Your Home (Copy)
Choosing a heat pump isn't quite as simple as picking one off a shelf. The right unit for your neighbour's house might be completely wrong for yours - and buying the wrong one is an expensive mistake to fix.
I've been helping South Canterbury homeowners choose heat pumps for over 25 years, and the questions I get asked most often are always the same: What size do I need? Which type is best? Does brand matter? Can I just use the same one my mate has?
So here's my honest guide to working through it properly.
Step 1 - Work out what you're actually trying to heat
Before you look at a single product, get clear on what you need. Are you heating one room - a lounge or a bedroom? A few rooms? Or do you want the whole house comfortable?
The answer to this shapes everything else:
One room → a single-room heat pump (wall unit or floor console) is usually the right answer
Two to five rooms → a multi-room system like the Mitsubishi Electric OmniCore could be the best fit - multiple indoor units, one outdoor unit
Whole home → a ducted central heating system is worth a serious look
Don't try to solve a whole-home problem with a single-room unit. A big, powerful heat pump in the lounge will heat the lounge brilliantly - but it won't heat your bedrooms. Getting this right at the start saves a lot of money and frustration later.
Step 2 - Think about your home's insulation and layout
A heat pump's ability to heat a room depends not just on its output - it depends on how well that room holds heat. A poorly insulated room with single-glazed windows needs a bigger unit than a well-insulated room of the same size.
This is one reason I always recommend an in-home assessment before recommending a specific unit. As someone with a builder's background, I look at ceiling and underfloor insulation, glazing, ceiling height, and how open or closed the floor plan is. All of these affect what size you actually need.
Buying a unit that's too small means it'll run constantly and still struggle. Buying one that's too large means it'll short-cycle - turning on and off frequently - which is inefficient and wears the unit out faster. Sizing matters.
Step 3 - Consider South Canterbury's climate
This is something that's specific to where we live and it's genuinely important.
Timaru averages around 93 frosty days per year. Inland areas like Fairlie, Geraldine, and Twizel get significantly colder than that. Standard heat pumps can lose heating performance as temperatures drop - which is exactly when you need them most.
Mitsubishi Electric's HyperCore technology is designed to address this directly. HyperCore units maintain their full rated heating capacity even in very cold conditions - they don't start struggling at 7°C the way standard units do. For anyone in South Canterbury, and especially for those in colder inland areas, I always recommend looking at HyperCore-equipped models.
Step 4 - Choose the right type of indoor unit
Once you know roughly what size and system type you need, there's still the question of which style of indoor unit suits your space.
High wall units are the most common - they mount on the wall near the ceiling and distribute heat across the room. They work well in most living areas and bedrooms.
Floor consoles are our best-seller in Timaru. They sit low on the wall, which makes them ideal for rooms where wall space is limited or where fireplaces or night-store heaters have been removed. Heat at floor level also feels more natural and even.
Ceiling cassettes are a good option for open-plan spaces where you want 4-way airflow without a wall unit taking up visual space.
Ducted grilles - if you're going ducted, you don't see a unit at all, just small grilles in the ceiling or floor. This is the cleanest aesthetic option.
The right choice depends on your room layout, your furniture arrangement, and your personal preference. Again - this is something worth talking through before committing.
Step 5 - Don't just buy on price
I understand the instinct to look for the cheapest option, but with heat pumps, the upfront price is rarely the full story. Running costs, reliability, and how long the unit lasts all matter.
Mitsubishi Electric is our primary brand because in over 25 years of installing heat pumps across South Canterbury, they've proven to be reliable, efficient, and well-supported. Cheaper brands can look attractive on paper, but if a unit needs frequent servicing or fails early, that initial saving disappears quickly.
We also only install what we're confident we can service and support. If something goes wrong with a unit we've installed, we're here to help sort it out.
Not sure where to start? Use our sizing tool or talk to us
If you want a rough starting point, our heat pump sizing tool can give you a general idea of what capacity you need for a given room.
But for anything more than a single-room unit - or if you're not sure which system type is right - I'd genuinely recommend getting in touch for a proper conversation. We'll ask the right questions, come and take a look at the home if needed, and give you a clear recommendation with no pressure.
Call us on 03 684 5298 or request a free quote here. We're based in Timaru and cover all of South Canterbury.