Understanding Air Source Heat Pumps: A Practical Guide for Property Developers and Commercial Clients

By Stephen Cottam, Director · Published 29 April 2025 · Updated June 2026

With energy efficiency and sustainability now central to building strategy, air source heat pumps (ASHPs) are becoming a go-to solution for heating and cooling in both commercial and residential developments. But knowing which system to choose - and how to get the best from it - isn’t always straightforward.

At Rossair, we use over 50 years of mechanical engineering and HVAC experience to help clients navigate these decisions with confidence. Whether you’re managing a large-scale property portfolio or overseeing new-build projects, our expert advice ensures you choose the right system and achieve maximum performance.

What Are Air Source Heat Pumps?

Air source heat pumps extract heat from the air outside - even in cold weather - and use it to heat buildings and hot water. They’re highly efficient and environmentally friendly, making them an attractive alternative to traditional gas or oil boilers, especially when paired with smart controls or other renewable technologies.

For commercial properties and new developments, ASHPs can provide a consistent, low-maintenance solution that supports energy-saving targets and long-term cost control.

Why Tailored Advice Matters

Not all air source heat pumps are the same. Building size, usage patterns, existing infrastructure, and energy goals all affect which type of system will work best. That’s why Rossair doesn’t take a one-size-fits-all approach.

Our team of experienced engineers and project managers assess each site individually, offering tailored recommendations to suit your needs. We work closely with property developers, facilities managers, and consultants to ensure systems are correctly specified, installed, and optimised from day one.

From Design to Delivery - and Beyond

Rossair provides full lifecycle support - from initial design and equipment selection to installation, commissioning, and maintenance. With offices in Hampshire and London, we cover a wide range of sectors including retail, industrial, and office spaces.

Our clients benefit from:

Detailed site assessments and system design
Integration with smart control systems
Support for achieving Net Zero and sustainability goals
Planned preventative maintenance to reduce downtime and maximise lifespan

With our proven track record, you can be confident your investment in ASHPs will pay off - not just in efficiency but in long-term reliability and cost savings.

How You Benefit From Air Source Heat Pumps

An air source heat pump is only as good as the team behind it. Poorly sized or badly installed systems can underperform and waste energy. Our team ensures your system is correctly matched to your building, giving you:

Reduced operational costs
Lower carbon emissions
Compliance with modern building standards
Improved occupant comfort

Why Choose Rossair?

Rossair has been delivering high-performance HVAC solutions for over 50 years. We’re trusted by commercial clients across the UK to provide honest advice, quality workmanship, and responsive support. Whether you’re planning a new project or looking to upgrade existing systems, we’re here to help you make informed, cost-effective choices.

Get in Touch Today

Don’t wait for issues to arise before considering your heating and cooling strategy. A proactive approach ensures long-term cost savings, compliance, and performance.

Contact Rossair today to discuss a tailored air source heat pump solution for your development or commercial property.

Quick facts

Air source heat pumps - the facts

UK performance benchmarks, lifespan, compliance and retrofit options for commercial buildings.

Service: Air source heat pump design, install, commission, maintain
Typical UK SCOP: 3.0-4.5 (seasonal coefficient of performance)
Operating range: Down to -15°C with modern inverter-driven systems
Compared to: Gas boiler (~90% efficient) - ASHP delivers 3-5x more heat per kWh
Typical lifespan: 15-20 years
Compliance framework: F-Gas (refrigerant), MCS (installation), SFG20 (PPM)
Hybrid retrofit: Yes - ASHP + existing boiler backup
Full retrofit: Yes - subject to emitter assessment at lower flow temperature
Sustainability framework: NCZ certified (Blue Status; Silver target end 2026)
Coverage: UK-wide; offices Alton (HQ), London (Aldgate)
In trade since: 1973 (52+ years)
Telephone: 01420 566822

Frequently asked

Air source heat pumps - common questions

How efficient is an air source heat pump in the UK climate?

A modern air source heat pump in the UK typically achieves a seasonal coefficient of performance (SCOP) of 3.0-4.5, meaning 3-4.5 kWh of heat output per kWh of electricity input. This holds well into UK winter conditions - modern inverter-driven ASHPs maintain efficient operation down to about -15°C. Comparison: a gas boiler is typically 90% efficient (under 1.0 COP equivalent).

What is the difference between air source and ground source heat pumps?

Air source heat pumps extract heat from outdoor air; ground source heat pumps extract heat from boreholes or ground loops. Ground source pumps achieve slightly higher SCOP (4.0-5.5) because ground temperatures are more stable than air. Air source pumps cost roughly half of ground source for installation because they don’t require drilling or ground works. For most UK commercial buildings, air source is the practical choice.

Can an air source heat pump heat a UK commercial building in winter?

Yes. Modern air source heat pumps maintain capacity down to about -15°C, well below typical UK winter temperatures. Sizing is critical: the unit must be specified to meet peak heating demand on the coldest expected day. For larger commercial buildings, multiple units are typically deployed for redundancy. Backup electric heaters or a small gas system can be added for resilience.

What grants are available for commercial heat pump installation in the UK?

Commercial UK air source heat pump grants include the Boiler Upgrade Scheme (BUS - primarily domestic but some non-domestic eligibility), Public Sector Decarbonisation Scheme for public buildings, and various local authority and Salix Finance funded schemes. The Industrial Energy Transformation Fund covers large industrial heat decarbonisation. Eligibility changes annually - Rossair’s feasibility documentation supports your accountant in confirming the available reliefs.

How long do air source heat pumps last?

A well-maintained air source heat pump typically lasts 15-20 years, comparable to a high-quality gas boiler. The compressor is the wear component most likely to fail first - usually replaceable rather than scrapping the whole unit. Critical to longevity: F-Gas leak checks under EU 517/2014, annual planned maintenance, and not running undersized units at constant peak load.

Can Rossair retrofit air source heat pumps to an existing commercial heating system?

Yes, with caveats. Hybrid systems (heat pump + existing boiler as backup) are the easiest retrofit. Full replacement requires verifying that existing radiators/AHUs work at lower flow temperatures (typically 45-55°C versus 70-80°C for gas boilers) - if not, emitters need upgrading. Rossair carries out the assessment, system design and installation as part of decarbonisation retrofits.

If we’re not the right fit, we’ll tell you who is

Talk to us about an air source heat pump for your building

Tell us about your building - size, current heating, occupancy. Your enquiry goes to our heat pump specialist. We call back within one working day.