Last Updated on June 27, 2025
Choosing between an air source heat pump and an air conditioner can be a significant decision for homeowners and landlords in the UK.
With rising energy costs and increasing demand for sustainable solutions, understanding the key differences and benefits of each system is crucial.
Whether you’re looking to upgrade an existing heating and cooling system or make your property more energy-efficient, this article will give you the knowledge you need to make an informed choice.
Contents
Air Source Heat Pump vs Air Conditioner: A Quick Comparison
The table below provides a side-by-side comparison of air source heat pumps and air conditioners, focusing on the criteria UK property owners care most about — efficiency, carbon emissions, installation cost, and more.
| Feature | Air Source Heat Pump | Air Conditioner |
|---|---|---|
| Functionality | Provides both heating & cooling | Cooling only (UK climate typically doesn’t require heating from AC units) |
| Energy Efficiency (SCOP/SEER) | SCOP ~ 3.2–4.5 / SEER ~ 6.0–8.0 | SEER ~ 3.0–4.0 |
| Heating Capability | Yes | No |
| Cooling Capability | Yes | Yes |
| Running Costs | Lower due to higher efficiency and dual-use | Lower upfront but higher over time due to single use |
| Carbon Emissions | Low (especially with green electricity) | Moderate to high (electricity-intensive and single-purpose) |
| Installation Cost | £6,000–£13,000 (with potential grants) | £1,000–£3,000 |
| Maintenance Needs | Annual servicing recommended, fewer moving parts | Occasional servicing, filter changes |
| Lifespan | 15–20 years | 10–15 years |
| Planning Permission | Usually not required (if below permitted development) | Not required in most cases |
What Are the Pros and Cons of Air Source Heat Pumps?
| Pros |
| Cons |
What Are the Pros and Cons of Air Conditioners?
| Pros |
| Cons |
Air Source Heat Pump vs Air Conditioner: Key Differences
Let’s explore the differences in more detail across key decision-making areas. This will help you determine what’s best for your home, rental property, or commercial space.
Energy Efficiency
Air Source Heat Pumps:
- Convert 1kW of electricity into 3–4.5kW of heat, making them up to 4.5 times more efficient than traditional electric heaters.
- Seasonal Coefficient of Performance (SCOP) values up to 4.5 mean they perform very well even during cold UK winters, providing reliable heating. For more on performance in low temperatures, see our article on how heat pumps work in cold weather.
- Eligible for government energy-saving schemes like the Boiler Upgrade Scheme, helping reduce installation costs while promoting greener homes.
Air Conditioners:
- Typically have a Seasonal Energy Efficiency Ratio (SEER) of 3–4, which reflects their cooling efficiency over a season.
- Designed primarily for cooling, they work best for short bursts during warmer months rather than continuous use.
- Energy consumption can spike during prolonged heatwaves, increasing running costs significantly without offering any heating benefits in colder months.
Winner: Air Source Heat Pumps
ASHPs offer significantly better year-round energy efficiency, can both heat and cool your property, and qualify for government incentives, making them the smarter long-term choice for UK homes.
Running and Installation Costs
Cost is often a deciding factor when comparing air source heat pumps vs air conditioners for UK properties.
While air source heat pumps cost more upfront, they offer lower running costs and long-term savings, especially when eligible for government funding.
The table below gives a side-by-side breakdown of installation and running costs:
| Cost Factor | Air Source Heat Pump | Air Conditioner |
|---|---|---|
| Installation Cost | £6,000–£13,000 (depends on property size, insulation & system complexity) | £1,000–£3,000 (split system or portable units) |
| Running Costs (annually) | Approx. £500–£900 (for heating & cooling combined, with thermostat & smart controls) | Approx. £200–£600 (cooling only, higher if used frequently) |
| Energy Source | Electricity (high efficiency – 1kW in = up to 4.5kW out) | Electricity (lower efficiency – 1kW in = ~1kW out) |
| Grant Eligibility | ✅ Eligible for Boiler Upgrade Scheme (£7,500 grant available) | ❌ Not eligible for heating-related incentives |
| Heating Capability | ✅ Yes – suitable for year-round comfort | ❌ No – cooling only, heating requires another system |
Air Source Heat Pumps:
- Installation: Between £6,000–£13,000, depending on your property’s size, existing heating system, and insulation levels. Groundwork, upgrades to radiators, or hot water cylinders may also factor in. To understand the full installation process and what it involves, refer to our air source heat pump installation guide.
- Running Costs: Typically lower over the year due to the system’s dual functionality and high efficiency (especially when paired with a smart thermostat). For detailed analysis, our heat pump running costs article breaks down typical expenses.
- Funding: You may qualify for the Boiler Upgrade Scheme, which offers up to £7,500 towards the installation cost.
Air Conditioners:
- Installation: From £1,000 for small split units to £3,000+ for multi-room systems.
- Running Costs: While cheaper to install, air conditioners can be less cost-effective over time—particularly during extended warm periods.
- Winter Inefficiency: You’ll still need a separate heating system, doubling up your energy consumption and costs.
This comparison makes it clear: air source heat pumps offer better value over time, especially for homeowners seeking year-round climate control with reduced energy bills.
Maintenance and Servicing
Air Source Heat Pumps:
- Require annual servicing to maintain performance and efficiency over the long term.
- Fewer moving parts compared to traditional systems, meaning a lower likelihood of mechanical failure.
- Often come with long warranties (5–10 years), giving homeowners added peace of mind.
Air Conditioners:
- Filters must be cleaned or replaced frequently to maintain air quality and system performance.
- More prone to issues like refrigerant leaks, blocked drainage, and compressor failure.
- While servicing may be less regular, problems can arise suddenly and often require urgent repairs.
Winner: Air Source Heat Pumps
They’re more reliable, easier to maintain, and typically come with longer warranties offering better long-term value and fewer unexpected repair costs.
Lifespan
Air Source Heat Pumps:
- 15–20 years with proper maintenance, offering long-term reliability.
- Performance may decline slightly after 15 years, but systems remain functional and efficient with regular servicing.
Air Conditioners:
- 10–15 years lifespan on average, depending on usage and maintenance.
- Efficiency tends to drop more noticeably over time, especially in older or heavily used units.
Winner: Air Source Heat Pumps
They have a longer operational life and retain efficiency better over time, making them a more durable and future-proof investment for UK properties.
Environmental Impact
Air Source Heat Pumps:
- Produce up to 65% fewer carbon emissions than conventional heating systems, especially when powered by renewable electricity.
- Pair exceptionally well with solar panels, further reducing your property’s overall carbon footprint.
Air Conditioners:
- Typically consume high amounts of electricity for cooling alone, contributing more to grid demand and emissions. If you want a comparison, read our guide on how much electricity an air source heat pump uses.
- Many models still rely on refrigerants with high global warming potential (GWP), increasing their environmental impact.
Winner: Air Source Heat Pumps
They are significantly more environmentally friendly, reducing carbon emissions and working in harmony with other renewable technologies like solar PV.
Air Source Heat Pump vs Air Conditioner: Which One to Choose?
When choosing between an air source heat pump and an air conditioner, it’s not just about comparing technical specs, it’s about choosing a system that fits the purpose, layout, and priorities of your property.
Ask yourself the following questions to make the right choice:
What’s the main goal of the upgrade?
If you’re aiming to make your property more energy-efficient, reduce your reliance on fossil fuels, or improve overall sustainability, a heat pump aligns better with those goals. If it’s simply about adding comfort during summer months, an air conditioner might suffice.
How is the space used throughout the year?
Homes or rentals that are occupied year-round will benefit more from a system that can both heat and cool. Meanwhile, holiday lets or short-term rentals may only require occasional cooling, making a simpler solution more suitable. Read our guide to learn more if your house is suitable for a heat pump.
Are you planning future improvements?
If you’re considering solar panels, insulation upgrades, or aiming for a higher EPC rating, a heat pump integrates well into that wider energy strategy. It’s also an excellent foundation for smart home systems and eco-retrofits.
Is long-term value more important than short-term savings?
Consider not just upfront costs but how your choice affects property value, running costs, and environmental impact over the next 10–20 years. Heat pumps are a long-term asset, while air conditioners are often short-term fixes.
What are the constraints of your property?
If you’re dealing with limited outdoor space, building restrictions, or need a quick solution for a specific room, an air conditioner might be the more practical option. Heat pumps, while more comprehensive, require space and professional installation.
Ready to Upgrade? Get a Free Air Source Heat Pump Quote from Eco Happy
Looking for a smarter, greener way to heat and cool your home?
Eco Happy makes switching to an air source heat pump effortless. Our team of certified engineers handles everything, from free surveys to full installation and support.
Whether you’re a UK homeowner, landlord, or commercial property owner, we tailor every installation to your property’s unique needs.
Get a free, no-obligation air source heat pump quote today.
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James Elston
Boiler Expert
James Elston is the top boiler replacement and heating expert at Eco Happy. He has over 20 years of experience in the industry, focusing on Gas Safe boiler installations and offering home-heating and energy-saving solutions to homeowners across the UK. From sourcing the most energy-efficient combi boiler to providing specialist heating advice, James ensures that Eco Happy maintains the highest standards and best customer service.