Multi-Room Heat Pump Systems
If you have more than one room in your home, odds are good that a single heat pump or AC unit isn’t going to cut it. That’s where a multi-room heat pump system comes in. With just one outdoor unit, you can add multiple indoor units (also called “heads”) spread around your home, each one controlled independently. It’s the least headache-inducing solution for whole-home air conditioning.
At Varcoe, with over a decade of experience supplying, installing, and servicing multi-room heat pump systems, here’s everything you need to know about this class of system. See for yourself if it makes sense for you and your family!
How It Actually Works
In a multi-room setup, you have just one outdoor unit sitting on the exterior wall or roof of your home. Connected to it are several pipes carrying refrigerants that run to all the different rooms in the house. Each room will contain an indoor unit (wall-mounted usually, but you can also opt for floor units or ceiling cassettes, depending on your space and needs).
Each of these indoor units, called “heads”, can be controlled separately. So, if your living room wants to be at 22°C and the bedroom wants 18°C – not at all a problem. Just pick up your remote (or phone, for WiFi-enabled systems) and set your wanted temperatures.
This is the reason why lots of customers have told us they regretted not having made the switch sooner. Not because the technology itself is amazing, but it’s just a lot less of a hassle and cheaper compared to running several independent single-room heat pumps.
Reasons to Make the Switch
Don’t Have Space for Multiple Outdoor Units
Every HVAC system has an outdoor unit to draw in (or expel) outside air. In a regular heat pump, one unit is piped to one condenser unit mounted outside your home. So, if we use this approach and you have five different rooms that you want to regulate, that means you’ll need to somehow find the space for five condenser units – not great if you simply don’t have the real estate.
A multi-room system uses just one outdoor unit, which directs the air to all the heads around the house. No need to worry, then!
You’re Renovating or Have an Older Home
A common nightmare for homeowners when rebuilding their HVAC system is ducting, especially if it’s a villa or an older home where extensive duct-fitting is either extremely difficult or impossible. Multi-room heat pumps don’t use a traditional ducting system. Rather, each head is connected with a small pipe carrying refrigerant and connected to the outdoor unit. These pipings are much less of a hassle to fit.
Lower Upfront Installation Costs
Installing five separate single-room heat pumps means five separate installation jobs, five sets of electrical work, five outdoor units to mount, and potentially five different quotes from technicians. Multi-room systems consolidate all this into one coordinated installation, so you’ll spend less on labor and materials upfront.
Simpler Maintenance and Future Servicing
With one outdoor unit to maintain, one filter to monitor, and one service contract to manage, if something goes wrong, one technician fixes one system instead of coordinating repairs across five different units. Long-term, this means fewer service calls, simpler warranty management, and a clearer picture of your HVAC health.
Installation in Your Home
First, we’ll take a look at your house’s layout to figure out where all the units will go, how the piping will be run (usually through existing cavities if possible, neat holes if not), and last but not least, the wiring.
After everything’s done, we’ll carefully test that the units, the pipes, and the electrical are all good to go. Typically, everything takes a couple of days – some homes with straightforward layout can take just a day, but others will need more work. We’ll tell you what it looks like for your place before we start.
Considerations for Your Multi-Room Heat Pumps
Size and Capacity
You don’t need huge capacity for each room – for instance, a bedroom doesn’t need a 5kW unit and neither does an office. A unit with 2.5-3.5kW will work fine for most rooms. On the other hand, living areas might need 5-6kW depending on size and insulation.
We size each unit for its actual space, not for maximum heat output to make sure your power bills stay reasonable even with multiple units running.
Unit Cost
More units obviously cost more than one unit. But not dramatically more per room than installing separate single systems. Plus, you’re saving money on the outdoor unit and piping since there’s just one line running out instead of multiple ones.
Ring us for a quote. We’ll break down what it would be for your specific home and rooms.
Maintenance
Same as single-room systems – you’ll need to clean the filter every month or two during heavy use, and an annual service check. That’s it!
When Not to Go Multi-Room (and When You Should)
Not sure if it’s the right kind of system for you? We’ll go over it if you give us a call, but just in case, you can use this table to have an idea of which system works best for your situation.
| Your Situation | Best Choice | Why |
|---|---|---|
| Only one room needs heating | Single-room unit | Cheaper upfront, simpler installation and maintenance. No need for the complexity of multi-room. |
| 3+ rooms with different temperature needs | Multi-room system | Each zone can be independently controlled. You only heat occupied spaces and save energy without running unnecessary units. |
| Small, open-plan home | Single large unit | One well-placed unit handles the airflow across the entire space. Multi-room adds unnecessary cost and complexity. |
| Whole house at consistent temperature all the time | Ducted system or single large unit | Multi-room is designed for zone flexibility. If you want uniform temperature throughout, a ducted system distributes air evenly or a single powerful unit does the job simpler. |
| Limited outdoor wall or ground space | Multi-room system | One outdoor condenser unit instead of multiple. Takes up far less room on your property. |
| Renovating an older home with no ductwork | Multi-room system | Small refrigerant pipes are easier to run than traditional ducts. Avoids the hassle and cost of extensive ductwork installation. |
| Budget-conscious, multiple rooms | Single units in key rooms | Install one or two single-room units in the rooms you use most. Expand later if needed rather than committing to a full multi-room system upfront. |
Frequently Asked Questions (FAQs)
Can I control each room independently, or do I have to set them all to the same temperature?
Each indoor unit has its own remote (or you can use a WiFi app on your phone for compatible systems), so you have complete independent control.
If I add more rooms later, can I expand a multi-room system?
Yes, in most cases. The outdoor unit is sized to handle multiple heads, so as long as there’s capacity, we can add additional indoor units to rooms you want to condition later. You won’t need a new outdoor unit – just new heads and piping runs. During your initial installation, we’ll discuss your future plans so we can size the system appropriately.
How much does a multi-room system cost compared to buying separate single-room units?
More units cost more overall, but not dramatically more per room than separate systems.
Do I really need to service a multi-room system annually, or can I just clean the filter occasionally?
Clean the filters every month or two during heavy use – that’s the hands-on part. For annual servicing, it depends on usage and system age, but we recommend annual checks to keep everything running efficiently and catch any issues early.
If one indoor unit breaks, does the whole system stop working?
No. If one head fails, the others continue running normally. You’ll lose climate control in that one room, but the system as a whole keeps operating. That said, we recommend getting a failed unit serviced quickly to avoid putting extra strain on the remaining heads. Ring us on 0800 088 888 if something stops working.
Let's Talk Through Your Space
Every home’s different. What works for a villa doesn’t work for a townhouse. What works for a family with kids doesn’t work for someone living alone.
Give us a call. Describe your layout, tell us which rooms you want climate control in, and we’ll figure out what actually makes sense. Could be multi-room. Could be a single unit in the right spot. Could be ducted.
Ring 0800 088 888 or email quotes@varcoe.co.nz. We’ll do a site visit and tell you straight up what the options are!