Heat pumps that just work.
Installed, fixed and looked after by your local Hampshire team.
Whether you need a new system, a same-week repair, or someone reliable to keep yours running sweet — we'll sort it. No jargon, no pressure, just honest work from engineers your neighbours already trust.
- Free, no-obligation home estimate
- Fixed prices — quote stands, no surprises
- Same-week repairs on most callouts
Tell us what you need
Quick form, real human reply — usually within a couple of hours.
Our Services
From installation to emergency repair, we deliver specialist heat pump and air conditioning services you can depend on.
Heat Pump Repair
Fast, accurate fault finding for underperforming or broken heat pump systems. We diagnose and fix the issue — not just the symptoms.
Servicing & Maintenance
Planned servicing to keep your heat pump running at peak efficiency. Reduce breakdowns and extend system life.
Heat Pump Installation
Correctly sized, professionally installed, and commissioned to perform from day one. All major brands.
Domestic Air Conditioning
Professional design and installation of air conditioning for your home. Stay cool in summer with minimal running costs.
Commercial Air Conditioning
Reliable air conditioning for offices, retail, and commercial premises. F-Gas compliant installation and servicing.
Pool Heat Pump Repair
Specialist diagnosis and repair for swimming pool heat pumps. All major brands, titanium heat exchanger expertise.
Pool Heat Pump Servicing
Annual servicing that keeps your pool heat pump efficient and prevents mid-season breakdowns.
Pool Heat Pump Supply
Correctly sized pool heat pumps supplied and installed. Extend your swimming season efficiently.
Commissioning & Optimisation
Fix underperforming systems. We measure actual COP, identify inefficiencies, and deliver measurable improvements.
Emergency Repairs (24/7)
System down? We offer 24/7 emergency callouts to get your heating or cooling back online fast.
System Upgrades & Retrofits
Upgrade emitters, controls, and cylinders to unlock the full efficiency of your existing heat pump.
Smart Thermostat Integration
The right thermostat, correctly configured for your heat pump — not a generic gadget that fights efficiency.
Health Checks & Reports
Independent performance assessment with measured COP data and prioritised recommendations.
F-Gas AC Servicing
F-Gas certified air conditioning servicing with full compliance documentation. REFCOM registered.
Annual Maintenance Contracts
Planned servicing, priority emergency response, and F-Gas compliance — one annual payment, total peace of mind.
Why Hampshire Homeowners
Choose Appian Heat Pumps
We don't just fix heat pumps — we make them perform the way they were designed to. From repairs to system optimisation, here's what sets us apart.
Accurate Diagnosis, Not Guesswork
We identify the root cause of underperformance — so you're not paying for repeat visits or unnecessary parts.
15+ Years of Specialist Experience
Craig Ball started in commercial heating and ventilation, then air conditioning, before specialising exclusively in heat pumps.
Results You Can Measure
Our commissioning and optimisation work delivers measurable improvements in system output and energy efficiency.
One Call, One Engineer, One Fix
No call centres, no middlemen. You speak directly to the person who will diagnose and fix your system.
Heat Pumps in Hampshire: What Local Homeowners Need to Know
Heat pumps are not one-size-fits-all. The same Mitsubishi Ecodan that performs beautifully in a new-build in Basingstoke can struggle in a draughty cottage near Winchester if it's been sized off a spec sheet rather than the house. After 15+ years working across the county, we know what trips Hampshire systems up — and how to design around it.
Hampshire's hard water shortens system life
Much of Hampshire — Basingstoke, Winchester, Andover and the surrounding villages — sits on chalk aquifers. Hard water scales plate heat exchangers, restricts flow and quietly kills efficiency. We flush, dose and protect every system we touch.
Mild, damp winters change how heat pumps run
Hampshire rarely sees deep cold, but the long damp shoulder seasons mean defrost cycles, weather compensation and emitter sizing matter more than peak output. Get those wrong and your COP collapses — even on a brand-new install.
Older housing stock needs a tailored approach
Victorian terraces in Winchester, post-war semis in Basingstoke and rural farmhouses across the county each behave differently. We size to the building, not a spreadsheet — and upgrade emitters or controls only where it actually unlocks performance.
Local response time matters too. Refrigerant faults, F-Gas leaks and frozen evaporators don't wait — and a heat pump engineer based two counties away simply can't get to you the same day. Because Appian is based in Basingstoke, most of Hampshire, Berkshire and Surrey is inside a 45-minute drive. Same-week heat pump repairs are the rule, not the exception.
Whether you're considering your first air source heat pump installation, struggling with a system that never quite delivers, or due an annual service, the right local engineer changes everything. That's the work Appian Heat Pumps does, every day, across Hampshire.
What Our Customers Say
Real feedback from homeowners and businesses across Hampshire.
Recent Work
A selection of heat pump installations, air conditioning projects, and specialist repairs from across Hampshire.
How It Works
Five simple steps, no jargon, no pressure — from first phone call to long-term aftercare.
Get in touch
Call, message or fill in the form. You'll speak to Craig or a real engineer — never a call centre — usually within two hours.
Free home estimate
We visit, measure, and listen. No pressure, no upsell. You get an honest assessment of what you actually need, in plain English.
Fixed written quote
A clear, itemised quote with a fixed price. The number we send is the number you pay — no surprise extras once work begins.
We do the work
Tidy installation, methodical repair, or planned service — completed by F-Gas certified engineers who specialise in heat pumps.
Aftercare & warranty
Full handover, manufacturer warranty registration, and an annual service reminder. We're a phone call away if you ever need us.
Craig Ball
Founder & Lead Engineer
Team photograph coming soon
About Appian
A Hampshire heat pump specialist — not a generalist plumber
Appian Heat Pumps was founded by Craig Ball, who started in commercial heating and ventilation, moved into air conditioning, and now works exclusively on heat pumps. Based in Basingstoke, the team covers Hampshire and the surrounding counties with one promise: do the job properly, first time.
We're F-Gas certified, REFCOM registered, and Mitsubishi Electric accredited — so the work is signed off, warranted and compliant. But credentials only matter if the engineer behind them actually knows the kit. That's why every installation, repair and service is carried out by a specialist — not a passing contractor.
Current Offers
Take advantage of these offers — designed to reward loyal customers and deliver more value. View all offers.
Free Heat Pump Health Check
Book any heat pump service and receive a complimentary system health check — we'll assess performance, efficiency and flag any potential issues before they become costly.
Book a Service →Annual Maintenance Contract
Lock in your annual servicing rate and get priority emergency response. Peace of mind that your system is maintained by a specialist, year-round. Learn more.
Enquire Now →Refer a Neighbour — Save £50
Recommend us to a friend or neighbour. When they book, you both receive £50 off your next service. Quality work speaks for itself.
Learn More →Frequently Asked Questions
Quick answers to the questions we hear most often.
Ready to Get Your Heat Pump
Working Properly?
Whether it's a repair, service, or new installation — get in touch for a no-obligation estimate. Most enquiries are responded to within 2 hours.
Mobile available 24/7 for emergencies
"Craig was brilliant — diagnosed the fault in under an hour when two other companies couldn't work it out."
— Sarah T., Basingstoke
Read all customer reviews →Request a Free Estimate
Fill in the form — we'll get back to you within 2 hours.