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Energy-Efficient Heating and Cooling Solutions for Your Home
When your heating or cooling system stops keeping up, replacement usually makes more sense than another repair bill. Sub Zero Heat installs heat pumps, AC systems, and high-efficiency HVAC equipment for homes across Duncan, Mill Bay, Chemainus, Cobble Hill, Cowichan Bay, and the surrounding valley.
We size each system to your home, handle the full installation, and walk you through every BC rebate that applies. Whether you are replacing equipment that has run its course or upgrading to something more efficient, the process is straightforward when you work with a crew that does it every day in the same communities.
Before recommending anything, we look at your home: square footage, insulation, existing ductwork, how the space is used, and how your current system has been performing. Sizing matters more than most homeowners realize. An oversized unit cycles too often and wears out faster. An undersized one runs constantly and struggles when temperatures drop. Getting this right from the start saves money over the life of the system.
We walk you through the options that suit your home and budget, including available rebates through the CleanBC Better Homes program and Greener Homes. Most Cowichan Valley homeowners are surprised by how much the upfront cost drops once rebates are factored in. We handle the paperwork.
Our licensed technicians remove old equipment if needed, complete the full install, and verify airflow, electrical connections, and refrigerant charge before leaving. The site is left clean and clear.
We test the system, configure controls, and make sure you understand what maintenance is required and what your warranty covers. You should feel confident using the system from day one, not left guessing.
We install high-efficiency systems for BC homes, whether you are replacing outdated equipment or upgrading for better year-round comfort and lower energy bills.
Cowichan Valley homes vary more than most people expect. Older heritage builds in Duncan have different ductwork, insulation, and electrical setups than newer construction in Shawnigan Lake or Mill Bay. Homes near Cowichan Bay deal with coastal air and humidity that affects equipment differently than properties further inland toward Lake Cowichan.
An installation that ignores those differences will work for a while, then create problems. We set each system up to handle the conditions specific to where the home sits, not just follow a standard spec sheet.
Our technicians are based in the valley and have worked across most of the communities we serve. That local familiarity matters when it comes to sizing, airflow, and making sure a system performs through BC’s damp winters and warm summers.
Over 100+ homeowners across the Cowichan Valley have left us five-star reviews on Google.
Every home is different. Whether you are replacing an old furnace with a heat pump or planning a full system upgrade for a renovation, we make the process straightforward. From selecting the right equipment to removing outdated systems, our focus is on installations that last and systems that perform.
We help homeowners throughout the Cowichan Valley with first time installs and complete system replacements.
Reach out to us here and we will get back to you as soon as we can.
We install heat pumps and AC systems across the Cowichan Valley. Our licensed technicians regularly work in:
Not on the list? Contact us. Our service area covers the full Cowichan Valley and surrounding communities.
Everything you need to know about upgrading or installing a new HVAC system in your home.
Age and reliability are the two main indicators. A heat pump or AC unit past 15 years is likely losing efficiency even when it appears to be working. If you are spending on repairs regularly, if the system struggles to maintain temperature during cold snaps or hot spells, or if your energy bills have crept up without explanation, a replacement assessment makes sense. We offer free quotes across the Cowichan Valley with no obligation.
Repairs make sense when the system is relatively young and the issue is isolated. Once repair costs start stacking up on an aging unit, replacement typically saves more money over the next five to ten years than keeping the old system alive. We walk you through both options so you can decide with a clear picture of what each one costs you long term.
Most installations are completed in one to two days, depending on the system type and your home. We provide a clear timeline before work begins so you know what to expect.
In most cases, yes. Heat pumps can replace older gas or oil heating systems and also provide cooling, which many older homes in the valley never had. We assess your home, size the replacement correctly, and handle the full installation including removal of the existing equipment.
Yes. Heat pump installations in the Cowichan Valley can qualify for rebates through the Better Homes BC program, with amounts up to $31,000 depending on what you are replacing and the system you are switching to. We walk you through what applies to your project and handle the paperwork as part of the installation.
Yes. We remove and properly dispose of your old system as part of the installation. You do not need to arrange separate disposal.
Yes. We work across Duncan, Ladysmith, Chemainus, Mill Bay, Cobble Hill, Shawnigan Lake, Cowichan Bay, Lake Cowichan, Honeymoon Bay, Koksilah, and surrounding communities. If you are not sure whether your area is covered, call us and we will confirm.
Yes, and this comes up a lot. The cold-climate heat pumps we install are rated to keep running efficiently well below -15°C, which is colder than the Cowichan Valley realistically gets. Even during a hard cold snap the system holds up. For anyone who wants a backup for extreme conditions, a hybrid setup pairs the heat pump with a gas furnace so both work together when temperatures drop hard.
Most homes do not need an electrical panel upgrade, and we confirm this during the assessment before anything is assumed. Some older homes switching from gas or oil do need one, but a lot of homeowners find their existing panel is already sufficient. If an upgrade is needed, you will know before installation day, not after.
Yes, in most cases your existing ductwork can be used. Where it becomes a factor is if it is leaking, undersized, or poorly routed, as that will limit how well even a properly sized system performs. We check it during the assessment and tell you what is worth keeping. For homes without ductwork at all, a ductless mini-split is usually the better direction.
Yes, heat pumps work well in older homes. The key is accounting for what makes older valley homes different — ductwork layouts, insulation levels, and electrical setups vary quite a bit between a heritage build in Duncan and something from the 90s in Mill Bay. We look at all of it before recommending anything so the system is matched to the actual home, not a generic spec.
Quieter than most people expect. Most modern outdoor units run at around 50 to 60 decibels, which is comparable to a normal conversation or a running fridge, and the indoor unit is noticeably quieter than that. Where the unit gets placed on your home matters too, and we factor that in during installation so it is not sitting directly outside a bedroom window.
Yes, a heat pump can handle your whole home. How it does that depends on the system — a ducted heat pump runs through your existing ductwork and covers the entire house the way a furnace would, while a ductless mini-split gives you room-by-room control for homes without ductwork or spaces that need independent temperature zones. We recommend the right setup based on how your home is laid out.
We install ducted heat pumps, ductless mini-splits, hybrid heat pump and gas furnace systems, central air conditioning, and air-to-water heat pumps. For homes coming off a wood stove, there is also a CVRD program specific to the Cowichan Valley that is worth looking at. We cover the full range so the recommendation we make is based on what actually suits your home, not what we happen to carry.
We are local, licensed, and have been doing this work across the Cowichan Valley long enough to know how homes here are built and what they actually need. Over 100 homeowners across the valley have left us five-star reviews on Google, and you can read what past customers have said before you ever pick up the phone.
