Is an Air Source Heat Pump Right for Your Home?

Thinking about making the switch to an air source heat pump? You're not alone. More and more homeowners across Kent and Sussex are exploring heat pumps as a cleaner, more efficient alternative to gas boilers and for good reason. The good news is that heat pumps can work in virtually any type of home. The key is making sure your system is designed correctly for your property, whether that's a well-insulated modern build or an older home with thicker walls and bigger rooms.

This guide will walk you through the key things to consider so you can make a confident, informed decision. No jargon, just straightforward advice.

What Is an Air Source Heat Pump?

An air source heat pump extracts heat from the outside air and uses it to warm your home and provide hot water, even in cold weather. Because it moves heat rather than generates it, an air source heat pump can be highly energy-efficient, typically producing around 2.5–4 units of heat for every unit of electricity it consumes. In practice that means lower energy use for the same warmth, and a significantly smaller carbon footprint, compared to a gas or oil boiler.

Is Your Property a Good Candidate?

Heat pumps can work in any type of home, the design of the system simply needs to be matched to your property. Here are the main factors to consider before taking the next step:

1. Property Type and Size

Heat pumps work well across a wide range of property types. They tend to suit:

• Detached and semi-detached houses

• New builds (which are often designed with heat pumps in mind)

• Bungalows and single-storey properties

Many of the rural properties we work with across the Kent and Sussex Weald - from older farmhouses near Goudhurst and Lamberhurst to period village homes in Brenchley, Matfield and Horsmonden - are excellent candidates, particularly where properties are off the gas grid and currently rely on oil or LPG. The key question in every case is how the system needs to be designed to keep the home warm at the lower temperatures a heat pump delivers. Flats and terraced houses can also work well, but it's always worth getting a proper assessment first.

2. Outdoor Space for the Unit

An air source heat pump requires an outdoor unit, similar in size to an air conditioning unit, positioned on an outside wall or in the garden. You'll need:

• A clear wall or outdoor area with good airflow

• Enough space for the unit to operate efficiently 

• Consideration of permitted development rules if you live in a conservation area or listed building

Most properties, particularly those with gardens or side return, have plenty of suitable space. If you're in a listed building or a conservation area, planning permission could be required.

3. Your Existing Heating System

Heat pumps operate at lower flow temperatures than gas boilers (typically 35–55°C), so the radiators in your home need to be sized to deliver sufficient heat at those temperatures. In a well-insulated home, your existing radiators may be perfectly adequate. In a less insulated property, larger radiators - and potentially more of them - will be needed to ensure every room reaches a comfortable temperature.

This isn't a reason to rule out a heat pump. Radiator upgrades are a routine part of many installations, and the cost is usually factored into the overall quote. Underfloor heating, where present, works especially well with heat pumps and rarely requires any changes.

Hot water storage is also an important consideration. Unlike a combi boiler, a heat pump system requires a hot water cylinder. If you don't already have one, you'll need to find a suitable location for it, typically an airing cupboard or utility space.

4. Insulation and Heat Loss

Insulation plays an important role in how efficiently your heat pump will run, but it's not a barrier to having one installed. A heat pump can work in any home, even one that isn't well insulated, but the system will need to be appropriately sized to compensate. In a poorly insulated home, this typically means installing larger radiators, and more of them, to distribute enough heat at the lower flow temperatures heat pumps operate at.

That said, improving insulation where possible is always worthwhile. It allows the heat pump to run more efficiently, reduces your energy bills, and means the overall system can be smaller and less costly. Before or alongside your installation, it's worth considering:

• Loft insulation (a minimum depth of 270mm is recommended)

• Cavity or solid wall insulation

• Double or triple glazing

• Draught proofing around doors and windows

If your home loses heat quickly and improving insulation isn't immediately practical, we'll design a system that accounts for this so you're warm and comfortable from day one.

Running Costs: What to Expect

Heat pumps are remarkably efficient, so much so that many homeowners find their energy bills are comparable to, or even lower than, what they were paying for gas, particularly in a well-insulated home.For those switching from oil or LPG the savings can be more significant. Oil and LPG prices are both volatile and generally higher than electricity costs when a heat pump's efficiency is taken into account.

It's also worth exploring smart energy tariffs designed specifically for heat pump users, such as Octopus Cosy or similar off-peak electricity plans. These can reduce the cost of running your heat pump considerably, particularly overnight when most systems do the majority of their heating work.

What Financial Support Is Available?

The costs of switching to a heat pump are more manageable than many people expect, particularly with the current government support in place:

• Boiler Upgrade Scheme (BUS): A government grant of £7,500 is available towards the cost of an air source heat pump, with no repayment required. Eligibility is straightforward for most homeowners with a valid EPC.

• Zero-rated VAT: Heat pump installations are currently zero-rated for VAT until March 2027, meaning no VAT on either the equipment or the installation, a saving of 20% compared to many other home improvement projects.

• Smart tariffs: Energy suppliers like Octopus offer heat-pump-friendly tariffs with lower off-peak rates that can meaningfully reduce your running costs.

We'll check your BUS eligibility as part of any survey and guide you through the application; it's something we handle on behalf of our customers regularly.

When Might a Heat Pump Not Be the Right Fit?

We believe in giving honest advice, not just telling people what they want to hear. While a heat pump can work in almost any home, there are some situations where it may not be the most practical option right now:

• You're in a very small property where a cylinder and outdoor unit would be impractical

• You're in a listed building with restrictions on external structures

• A full radiator replacement isn't currently feasible and your home has significant heat loss

In these cases, we'll say so clearly. Alternatives such as a hybrid heat pump - which pairs a heat pump with a gas or oil boiler to handle peak demand - can be a very effective middle ground. Whatever we recommend, it will be based on what's genuinely right for your home, not what's easiest to sell.

Ready to Find Out If Your Home Qualifies?

The easiest way to get a straight answer is to use our free online quoting tool. Answer a few short questions about your home and heating setup (it takes around 2–3 minutes) and you'll receive a personalised quote, including system recommendation, installation costs, grant eligibility and projected savings. No obligation, no pressure.

With the £7,500 Boiler Upgrade Scheme grant and zero VAT on installations until March 2027, now is a great time to find out what's possible for your home.

Get your free heat pump quote here.