Multi-Room Heat Pumps - How They Work and When to Choose One
One of the most common conversations I have with customers goes something like this: "We've got a heat pump in the lounge but the bedrooms are freezing. What do we do?"
There are a few different answers to that question, and one of them is a multi-room heat pump system. It's a solution that sits neatly between a collection of separate single-room units and a fully ducted whole-home system - and for the right home, it's a really good fit.
Here's what you need to know.
What is a multi-room heat pump system?
A multi-room system - sometimes called a multi-split system - connects multiple indoor units to a single outdoor unit. So instead of having three separate outdoor units cluttering up the side of your house to heat three rooms, you have one. The indoor units in each room all run from it.
The system we install here at The Heat Pump Shop is the Mitsubishi Electric OmniCore, which can connect up to eight indoor units to a single outdoor unit. Each indoor unit operates independently, so different rooms can be set to different temperatures at the same time.
What types of indoor units can you mix and match?
This is one of the things that makes a multi-room system genuinely flexible. You're not locked into one type of unit across the whole home. With the OmniCore system you can mix and match from:
High wall units - the most common option, suits most living rooms and bedrooms
Floor consoles - great for rooms where wall space is limited, or for people who prefer heat coming from floor level
Cassettes - ceiling-mounted, recessed into the ceiling for a cleaner look
Ducted - yes, you can even include a small ducted zone as part of a multi-room system
That last point is worth noting - if you have a hallway or open-plan area that's hard to heat with a standard wall unit, you can incorporate a small ducted run as one of your zones. It's a level of flexibility that a lot of people don't realise is possible.
How is this different from just buying multiple single-room heat pumps?
Good question, and it comes down to two things: aesthetics and practicality.
With separate single-room units, each room needs its own outdoor unit. If you're heating three bedrooms and a living room, that's four outdoor units on the outside of your house. It looks cluttered, and it takes up space - which can be an issue on smaller sections or homes where outdoor aesthetics matter.
A multi-room system gives you the same result - individual control in each room - with just one outdoor unit outside. The home looks cleaner, installation is generally more straightforward, and long-term maintenance is simpler.
The other advantage is future-proofing. The OmniCore system lets you start with two or three indoor units and add more later as your needs change or your budget allows. You're building on a platform rather than starting from scratch each time.
How does it compare to a ducted system?
Ducted heating is the fully invisible option - nothing visible except grilles in the ceiling or floor. If that's important to you, ducted is worth considering.
Multi-room systems have visible indoor units in each room, so they're not quite as seamless aesthetically. But they're also typically less expensive to install than a full ducted system, and they're easier to retrofit into an existing home where getting ducting through walls and ceilings would be complicated or disruptive.
As a rough guide: if you're building new and want whole-home heating that's completely hidden, ducted is usually the better choice. If you're in an existing home and want to heat multiple rooms without major building work, a multi-room system often makes more sense.
Is a multi-room system right for your home?
It's likely a good fit if:
You want to heat two to five rooms but don't want multiple outdoor units
You're in an existing home where ducted installation would be complex or disruptive
You want individual temperature control in different rooms
You want flexibility to choose different unit styles for different rooms
You're thinking ahead and want the option to add more zones later
It's worth having a proper conversation with us before committing either way. The right answer genuinely depends on your home's layout, insulation, and what you're trying to achieve - and that's something I always assess in person before recommending anything.
Ready to find out what's right for your home?
We've been helping South Canterbury families work out the best heating solution for their homes for over 25 years. Whether it's a multi-room system, a ducted setup, or something else entirely, we'll give you honest advice and a clear quote.
Call us on 03 684 5298 or request a free quote here and we'll arrange a time to come and take a look.