Heat Pumps and Energy Retrofits in Europe: Grants, Contractors, and the Catch

A heat pump only pays off in a home that can hold heat, which is why the right order is almost always insulation first, heat pump second — and why the biggest grants across Europe reward exactly that sequence. Most national schemes will subsidise a large chunk of an energy retrofit, but nearly all attach two conditions worth understanding before you sign: the work must be done by a certified installer, and the pump must be correctly sized to a properly insulated building. Skip either and you risk an oversized system, a disappointing bill, and in some cases a grant you have to pay back.

Start with the EPC, not the kit

The Energy Performance Certificate (EPC) is the common language of European retrofits. It rates how much energy your home needs and, crucially, points at the cheapest improvements first. A poorly rated home bleeds heat through the roof, the walls and the windows; drop a heat pump into that and you have bought an efficient machine to fight a losing battle. The certificate is also increasingly the thing grant programmes and lenders look at, because a measurable before-and-after is how they justify the subsidy.

The sensible retrofit runs roughly in this order:

• Airtightness and insulation — loft or roof, walls where feasible, and draught-proofing; the cheapest kilowatt is the one you never need.
• Glazing and doors where they are the weak point.
• Then the heat pump, sized to the now-lower heat demand of the improved building.
• Controls and, if relevant, adjusting radiators or moving to underfloor for lower flow temperatures.

Why insulation has to come first

Heat pumps are happiest running steadily at low flow temperatures. An uninsulated house demands high output on cold days, which pushes the pump into its least efficient range and can leave rooms cold anyway. Insulate first and the heat demand drops, which lets you fit a smaller, cheaper pump that runs efficiently — a double saving that also improves comfort. Doing it the other way round means sizing the pump for a building you are about to change, which is how people end up with oversized, short-cycling systems.

The grant landscape, in plain terms

Every country we cover runs some version of the same idea: the state pays part of the cost of measures that cut a home's energy use, with bigger support for deeper improvements and for lower-income households. The mechanics vary, the branding varies, and the exact percentages change from year to year — so treat any figure you read as provisional and check the current scheme before you count on it.

• Germany runs its support through KfW and the BEG (Bundesförderung für effiziente Gebäude) framework, combining grants and subsidised loans for efficiency measures and heat pumps.
• France offers MaPrimeRénov', which pays toward retrofits on the strict condition that the work is carried out by an RGE-certified (Reconnu Garant de l'Environnement) installer.
• Italy and other markets have run ecobonus-style tax deductions that give you back a share of qualifying works over time.
• The Nordics lean more on low-cost financing, standards and electricity pricing than on headline grants, since heat pumps are already mainstream there.

The common thread is conditionality. The money is real, but it is tied to certified installers, eligible measures, and often a minimum improvement in the home's energy rating. Read the conditions as carefully as you read the percentage.

Why a certified installer is non-negotiable

In most schemes, using an accredited installer is not a nicety — it is the eligibility condition. France's MaPrimeRénov' hinges on RGE certification; other countries maintain their own approved-installer lists. Beyond unlocking the grant, certification is a proxy for the one thing that makes or breaks a heat pump: whether it is sized and commissioned correctly. A good installer does a heat-loss calculation for your actual building, chooses flow temperatures your emitters can handle, and commissions the system so it runs efficiently from day one.

This is exactly the kind of check worth doing before, not after, the deposit. Veted verifies that an installer's certification and insurance are current and that their review history holds up, so "certified" means certified today rather than on a lapsed certificate from three years ago.

The catch nobody mentions

Grants come with strings, and the strings have teeth. Several schemes can claw the money back if the work is not completed to standard, if the certification was invalid, or if the property changes use within a set period — so a corner cut by the installer can become your repayment. Add the technical failure modes and you have a short list of things that turn a smart upgrade into an expensive regret:

• Grant clawback if conditions are not met or paperwork is wrong — keep every certificate and invoice.
• Oversizing, which raises the price and wrecks efficiency through short-cycling.
• Cowboy installers who skip the heat-loss calculation and simply swap a boiler for a pump of the same rating.
• Unrealistic savings claims — be sceptical of anyone promising specific bill reductions before they have seen your EPC and done the maths.

A heat pump is a genuinely good investment in the right house, fitted by the right person, in the right order. Insulate first, get the EPC done, use a certified installer whose credentials you have actually checked, and read the grant conditions as though you will one day have to prove you met them — because you might. Do that and the subsidy works for you instead of hanging over you.