Heat pump quotes are hard to compare because the good ones and the careless ones use the same vocabulary. These eight questions separate them quickly, and none of them require any technical knowledge to ask or to judge.
Home Comfort Assured Renewables gives renewable heating advice across Watford, and publishes these questions because a household that asks them well hires better, whoever they eventually choose.
The four design questions
Ask how the heat loss was calculated: room by room from measurements, or estimated from floor area? Ask what flow temperature the system is designed to run at, because that single number drives efficiency and the emitter list. Ask which radiators change and why, expecting a room-level list rather than a shrug. Ask how the cylinder size was chosen, expecting your own morning described back to you.
Four crisp answers indicate a design; four vague ones indicate a price. The vocabulary is identical, so the specificity is the tell.
- How was heat loss calculated?
- What flow temperature is this designed for?
- Which emitters change, room by room, and why?
- How was the cylinder size decided?
The two delivery questions
Ask why the outdoor unit goes where it goes, expecting reasoning about airflow, noise lines, neighbours and pipe run rather than convenience. Ask what commissioning involves and what readings will be recorded, because a system handed over untuned is a machine, not a heating solution.
Both answers also reveal attitude: installers who have thought about your neighbour's bedroom window, and who expect to be judged on recorded readings, tend to be the ones who return calls afterwards.
- Why this outdoor position specifically?
- What does commissioning include, and what gets recorded?
The two honesty questions
Ask what aftercare looks like: who services it, how often, what the first-year support includes. A firm that installs and vanishes leaves a household alone with a machine it has not learned yet.
Then ask the question that separates the trustworthy most sharply: under what circumstances would you tell me not to do this yet? An installer with a genuine answer, fabric work needed first, unresolved cylinder space, a boiler with years of good life, is one whose yes can be believed.
Reading the answers
Strong answers are specific, comfortable and often slightly boring: numbers, room lists, reasons and constraints. Weak answers are enthusiastic and general, brand-led, or impatient with the questions themselves, which is itself the most useful signal of the eight.
Home Comfort Assured Renewables expects to be asked all eight and answers them in writing as part of survey and quote planning. The questions cost nothing and they change what households buy.
Related pages
Questions customers ask
What is the single most revealing question to ask a heat pump installer?
What flow temperature is this system designed to run at? It forces a design answer, exposes whether emitters were audited, and predicts the running cost more honestly than any brand discussion.
Should an installer ever advise against a heat pump?
Yes, when fabric work should come first, cylinder space is unresolved or a recent boiler has years left. An installer with no not-yet answer has no judgement to sell.
What aftercare should come with an installation?
Annual servicing, first-year support while the household learns the controls, and someone who returns calls. The machine is half the purchase; the relationship maintaining it is the other half.
Four design questions, two delivery questions, two honesty questions: ask them of everyone and the quotes sort themselves into designs and prices.
Home Comfort Assured Renewables answers all eight in writing for Watford households. The contact page starts the conversation.
