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Is My West Sussex Home Suitable for a Heat Pump?
If you’ve been looking into heat pumps, there’s a good chance you’ve come across someone online or even a tradesperson saying your home “isn’t suitable” for one. Too old, not enough insulation, radiators too small, walls not insulated. The list goes on.
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Is My West Sussex Home Suitable for a Heat Pump? | Revolution Heating
If you’ve been looking into heat pumps, there’s a good chance you’ve come across someone online or even a tradesperson saying your home “isn’t suitable” for one. Too old, not enough insulation, radiators too small, walls not insulated. The list goes on.
Here’s the truth: the vast majority of homes in West Sussex are suitable for a heat pump. Not “suitable with a few caveats.” Suitable, full stop. It comes down to good system design, and in most cases, your home is already further along than you think.
In this article, I want to walk through what actually makes a home ready for a heat pump, why most West Sussex properties already tick these boxes, and clear up one of the biggest misunderstandings homeowners have about heat loss.
The Big Misconception: Does My House Lose Too Much Heat for a Heat Pump?
This is the one I hear most often, and it’s based on a misunderstanding of how heat loss actually works.
Every home loses heat. It’s physics. Heat moves from warm spaces to cold ones, through your walls, windows, roof, and floor. The rate at which your home loses heat is called its heat loss, and it’s measured in kilowatts (kW).
Here’s the part that surprises people: your home’s heat loss is exactly the same whether you heat it with a gas boiler, an oil boiler, or a heat pump. The heat source doesn’t change how quickly your house loses heat to the outside. Your walls, windows, and roof don’t behave any differently depending on what’s sat in the cupboard heating your water.
What changes is how that heat is replaced.
A gas boiler can blast out very high temperatures (70-80°C) for short bursts, which is why older systems were often oversized and inefficient, but ran fine because the boiler could just work harder. A heat pump works most efficiently at lower flow temperatures (typically 35-55°C), running for longer, steadier periods. Essentially, replacing the heat as it leaves the house rather than blasting the house with heat from a cold start.
So the real question isn’t “does my house lose too much heat for a heat pump?” Every house loses heat, and a heat pump can be sized to replace it. The real question is “what size and type of heat pump, and what changes (if any) does my heating system need, to deliver that heat efficiently at lower temperatures?”
That’s what a proper heat loss survey is for, and it’s the foundation of every job we do.
Why a Heat Pump Doesn't Need to "Blast" Your House Like a Boiler Does
This trips a lot of people up. With a gas boiler, the system is often designed to heat a cold house up quickly and blast it with high temperatures for a short period, then switch off until the next demand. It’s a bit of a feast-and-famine approach, and it’s part of why rooms can feel like they swing between too hot and too cold.
A heat pump is sized differently. Rather than being sized to rapidly reheat a cold house, it’s sized to continuously replace the heat your home is losing, matching output to heat loss, little and often, to maintain a steady, even temperature throughout the day. Think of it less like speeding off in your car and then hitting the brakes, and more like steadily maintaining the correct speed and being more comfortable whilst doing so.
This is one of the most common things customers notice after a heat pump install. Rooms feel more consistently warm, rather than swinging from cold to roasting and back again.
Radiant Heat vs Convected Heat: Why It Feels Different
There’s another difference that often goes unmentioned, and it’s one of the nicer side effects of running a heat pump at lower flow temperatures with correctly sized radiators (or underfloor heating).
Traditional high-temperature systems rely heavily on convected heat. Air heats up against a hot radiator, rises, and circulates around the room. This is quick, but it also stirs up dust and can leave rooms feeling like they have hot and cold spots depending on where you’re sitting.
Heat pump systems, running at lower temperatures over larger surface areas, produce a higher proportion of radiant heat Warmth that radiates outward from the radiator or floor, similar to the way you feel warmth from a sun-warmed wall, rather than from hot air blowing past you.
Many people find this more comfortable – a steadier, more even warmth rather than the “hot air blast” feeling. It’s also often better for allergy sufferers, since there’s less aggressive air movement stirring up dust and allergens around the room.
Why Most West Sussex Homes Are Already Well Placed
West Sussex has a real mix of housing stock — from Victorian terraces in Worthing and Horsham, through 1930s semis, post-war estates, to the newer developments around Angmering, Rustington, Southwater, and Burgess Hill. The good news is that across almost all of these eras, certain upgrades have already happened that make a heat pump a much easier fit than people assume.
Cavity Wall Insulation
If your home was built from the 1930s onwards with cavity walls, there’s a strong chance it’s already insulated. Cavity wall insulation became widespread through government schemes from the 1990s onwards, and it makes a significant difference to heat loss and is often one of the biggest single factors in how “heat pump ready” a home is.
Double Glazing
Single glazed windows are now genuinely rare in West Sussex. Whether it was replaced for comfort, noise, or just because the old frames had had their day, most homes, even much older ones, now have double glazing throughout. This alone removes one of the historically biggest sources of heat loss in older properties.
Loft Insulation
Loft insulation has been a standard recommendation (and often a free or subsidised upgrade) for so long that the vast majority of homes have at least some in place, even if it’s due a top-up. Heat rises, so a well-insulated loft is one of the most cost-effective ways to reduce overall heat loss.
Modern or Upgraded Radiators
Even in older homes, radiators tend to get replaced over the decades as bathrooms and kitchens are renovated. Many properties already have radiators that are larger than strictly necessary for the old boiler — which, as it turns out, is often exactly what’s needed for a heat pump running at lower temperatures.
Are Heat Pumps Suitable for Older or Victorian Properties?
If your home doesn’t have cavity walls – think Victorian or Edwardian properties common in parts of Worthing, Horsham town centre, and surrounding villages. It doesn’t rule a heat pump out either. It just means the design process looks a bit closer at the fabric of the building: wall construction, glazing, floor insulation, and so on.
The heat loss might be a little higher than a 1990s semi, but that simply feeds into the sizing of the system. A larger heat pump, possibly larger radiators in a room or two, or in some cases additional insulation recommended alongside the install. None of this makes a heat pump unsuitable. It just means the design has to reflect the building in front of us, rather than assuming a one-size-fits-all answer.
This is really the heart of it: suitability isn’t a yes/no based on the age of your house – it’s a design exercise based on the realities of your specific home.
One honest caveat worth mentioning: very large or older properties with higher heat loss will generally need a larger heat pump to match. In a small number of cases, a bigger unit can mean needing a three-phase electricity supply rather than the standard single-phase most homes have. This is genuinely rare in our experience. The vast majority of homes, including larger older ones, are perfectly well served by a single-phase system, but it’s the kind of thing a proper survey identifies early, so there are no surprises later in the process.
Other Things That Make West Sussex Homes Heat Pump Friendly
A few other factors that often work in homeowners’ favour:
- Outdoor space – Most West Sussex properties, from terraces with side access to detached homes with driveways, have somewhere suitable to site an outdoor unit without it being intrusive.
- Existing hot water cylinders – Many homes already have a cylinder (rather than a combi boiler), which is a head start, as heat pumps work with a cylinder rather than heating water on demand.
- Electrical supply – Most modern consumer units and mains supplies can accommodate a heat pump without major electrical upgrades, though this is always checked as part of the survey.
So, Is Your Home Suitable?
If you’re in West Sussex and wondering whether your home could work with a heat pump, the honest answer is: almost certainly, yes. Whether you’re in a new-build in Angmering, a 1960s semi in Lancing, or a period terrace in Horsham, the starting point is the same -a proper heat loss survey that looks at your home as it actually is, not as a generic assumption.
To put that into perspective, we’ve installed heat pumps in everything from a 500-year-old barn conversion, through 1930s terraces, right up to brand new SIPs panel new-builds. Each one is a different design exercise, but every single one came down to the same thing – understanding the heat loss of that specific building and designing a system to match it.
Heat loss doesn’t care what’s generating the heat. A heat pump just needs to be designed to match it and in the vast majority of West Sussex homes, that’s a perfectly achievable job.
Want to Know for Sure?
The only way to know exactly how your home performs, and what a heat pump installation would look like for you, is a proper heat loss survey carried out by someone who knows what they’re doing.
No assumptions, no generic answers – just an honest assessment of your home and what it needs.
Covering West Sussex and surrounding areas, including Worthing, Horsham, Angmering, Rustington, Lancing, Southwater, Burgess Hill, and Haywards Heath
Ben Torbet | Revolution Heating | West Sussex
