The Heat Pump Sceptic Who Changed Their Mind

Dave Thompson, 58, from the Cotswolds, was what you might call a professional heat pump sceptic. He read every negative article, shared every critical forum post, and told anyone who would listen that heat pumps were an expensive con pushed by government and green lobbyists. His gas boiler worked fine, thank you very much. Then his boiler broke. And his neighbour — the one with the heat pump he had spent two years criticising — showed him the numbers. This is the story of how a sceptic became a convert, told in his own words.

What I Believed

In Dave's words:

"I had a long list of reasons heat pumps were rubbish. Here they are — I am not proud of them, but I am honest about them:

• 'Heat pumps do not work in cold weather' — I had read this in the newspapers and believed it completely
• 'The running costs are higher than gas' — I had seen forum posts from people whose bills went up
• 'You need to rip out all your radiators' — I thought it was a massive, disruptive job
• 'They are incredibly noisy' — I imagined a constant industrial hum in my garden
• 'They are too expensive even with the grant' — I thought the real cost was much higher than quoted
• 'It is all a government scam to sell expensive equipment' — I will admit I had gone down the conspiracy rabbit hole

"Looking back, every single one of these beliefs was either completely wrong or wildly exaggerated. But at the time, I was certain."

The Day the Boiler Died

"November 2024. The boiler that I had defended so passionately for years decided to prove my loyalty was misplaced. The heat exchanger cracked. The repair quote was £1,800 — for a boiler that was 16 years old and might need replacing within 2-3 years anyway."

"A new gas boiler would cost £2,500-3,500 installed. A heat pump would cost £12,000 — but with the BUS grant of £7,500, the actual cost was £4,500-5,500. Suddenly the price difference was not as dramatic as I had assumed. And I was staring at it from a cold house in November."

The Neighbour's Evidence

"My neighbour Mike had installed a heat pump 18 months earlier. I had given him a hard time about it — good-natured ribbing, but I genuinely thought he had wasted his money. After my boiler died, Mike invited me round for a cup of tea and a look at his energy data."

"He showed me his app — 18 months of electricity consumption, COP readings, and costs. He had been paying approximately £680/year for heating and hot water, compared to my £1,050/year on gas. His house was similar to mine — same era, similar size, similar insulation."

"Then he showed me the thermostat: 20.5°C. His house was warmer than mine. And quieter — I could not hear the outdoor unit at all from inside his house. Even standing next to it in the garden, it was barely audible."

"That evening, I sat at my kitchen table — wearing a jumper because my house was cold — and read our guide on whether heat pumps are worth it. For the first time, I read with an open mind rather than looking for reasons to dismiss it."

Making the Decision

"I got three quotes from MCS-certified installers. All three did proper site surveys — measuring rooms, checking insulation, assessing radiators. The red flags guide was useful — I could see that all three installers were legitimate and thorough."

"The quotes ranged from £11,200 to £13,800 before the grant. After the £7,500 grant, that was £3,700 to £6,300. Three of my radiators needed upgrading. The middle quote — £12,100 before grant, £4,600 after — recommended a Vaillant aroTHERM 8kW. I went with them."

"I will be honest: I was still nervous. Part of me expected to be proved right — that heat pumps were all hype. I wanted to give it a fair chance, but I was prepared for disappointment."

Installation Day

"Two days. Day one: old boiler out, new cylinder in, pipework modified, outdoor unit installed. Day two: electrical connection, commissioning, three new radiators fitted. By 4pm on day two, the system was running."

"The commissioning engineer spent an hour setting everything up — weather compensation, flow temperatures, hot water schedule. He was patient, explaining everything in plain language. I asked every question I could think of. He answered them all without making me feel stupid."

"My first thought when I touched the radiator: 'It is warm, not hot.' My second thought, 30 minutes later, when I checked the room temperature: 'The room is 20°C. How is it 20°C from a warm radiator?' That was the moment my scepticism started to crack."

The First Month

"The first month was a psychological battle. Every morning I checked the app. Every evening I felt the radiators. I kept expecting it to fail, to reveal its inadequacy. It did not."

"Electricity cost for December (my first month): £78. My typical gas bill for December was £140. I saved £62 in month one. That got my attention."

"The house was warm. Consistently, evenly warm. Not the on-off cycle I was used to with the gas boiler — just a steady, comfortable 20°C all day. My wife noticed it before I admitted it: 'It is actually more comfortable, is it not?'"

The First Winter

"January was the real test. We had a week of -4°C to -6°C. I remember thinking: 'This is where it falls apart.' It did not. The house stayed at 20°C. The COP dropped to about 2.5 — meaning it was still producing 2.5 units of heat for every unit of electricity. Less efficient than on a mild day, but still vastly better than a gas boiler."

"February: similar temperatures. Same result. The heat pump just kept going. No drama, no failure, no lukewarm house. Just reliable, steady heating."

"By March, I had completed a full winter. Total winter heating cost (December to March): £280. My typical gas winter cost: £480. I had saved £200 in one winter — and this was my first year, before optimising anything."

My Myths vs Reality

Where I Am Now

"Fourteen months in. Annual heating and hot water cost: £680. That is £370 less than my gas boiler — and my gas boiler was new and efficient. Over 20 years, that is £7,400 in savings — more than the system cost me after the grant."

"But it is not just money. The house is more comfortable. The air feels cleaner (no combustion products). There is no annual gas safety check to organise. And I genuinely feel good about not burning fossil fuel to heat my home."

"I have become what I used to mock: a heat pump evangelist. Three of my neighbours are now getting quotes, partly because I invited them round to see the system and feel the warmth. I even showed one of them how to use the cost calculator."

"I am also planning to add solar panels next year. Mike (the neighbour) already has them, and his heat pump electricity cost is about half of mine. The sceptic in me is completely dead."

My Advice to Other Sceptics

"If you are where I was — reading negative articles, sharing critical comments, telling people heat pumps are a con — I have one piece of advice: go and visit someone who has one."

"Do not read another article. Do not watch another YouTube video. Go to a house with a heat pump. Feel the warmth. Look at their bills. Ask them every question you have — the honest ones, the awkward ones, the ones you think will catch them out. That is what changed my mind. Not marketing. Not government campaigns. Personal experience and real data."

"And if you do take the plunge, get at least 3 quotes from MCS-certified installers. The installer makes all the difference. Mine was brilliant — patient, thorough, and happy to answer a sceptic's barrage of questions."

Frequently Asked Questions

What convinced the sceptic?

His gas boiler broke, and his neighbour showed him 18 months of real energy bills proving significant savings. The data changed his mind — not marketing.

What was his biggest concern?

That heat pumps would not keep the house warm in winter. After installation, he found the house was consistently warmer and more comfortable than with his gas boiler.

Did all his myths prove wrong?

Yes, every single one. Cold weather performance, running costs, noise, radiator replacement, and cost — all were either completely unfounded or significantly exaggerated.

What does he say to other sceptics?

"Go and visit someone who has one. Feel the warmth. Look at their bills. Personal experience beats newspaper articles every time."

Is he now an advocate?

Actively. He has helped three neighbours start getting quotes and invites anyone curious to visit his home and see the system.

What would change other sceptics' minds?

Personal experience. Visiting a heat pump home, seeing real bills, and talking to real owners is more effective than any marketing campaign.