Hello, my name is Gary Hockins, Retrofit Projects Manager at Aspecte. I have spent more than ten years in the energy sector and installed most renewable technologies in my own home. Aspecte is MCS-certified and a registered RECC member, covering air source heat pumps across Norfolk and East Anglia. I understand the concerns and common heat pump questions that often arise when you are looking to make your home more energy-efficient.
I would like to answer a few frequent questions I’ve been asked about air source heat pumps to help you make a well-informed choice.
Common heat pump questions: What are the typical running costs?
The efficiency of air source heat pumps is widely recognised, and they can lower your heating expenses considerably. They pull heat from the air outside and use it to warm your home and water — even when outdoor temperatures are very low.
How much you save depends on several things: your home’s size, how well it is insulated, your heating habits, and the electricity tariff you are on. Real-world performance varies quite a bit. Recent government-funded monitoring through the Electrification of Heat Demonstration Project across 700-plus UK homes found that heat pumps can be highly efficient in all property types. Design and installation quality remain the most important factors, which is why we follow the latest MCS design standard (MIS 3005-D V3.0) on every design we produce.
How should homeowners address poor insulation?
An air source heat pump can offer maximum benefits only if your home is thoroughly insulated. If your home is poorly insulated, you may lose a sizeable portion of the heat the pump generates. That heat loss would then force the pump to run more often — a problem made worse by the fact that the pump is likely generating heat at a lower temperature than a conventional heater.
I advise beginning with loft and cavity wall insulation because these are frequently the most effective places to insulate. From my own experience, adding insulation makes a noticeable difference in keeping a home warm. That improves the efficiency of the heat pump, but even more important, it greatly increases the comfort level of the house. National monitoring projects have shown that addressing building fabric improves seasonal performance significantly, reminding us that your home’s structure matters as much as the hardware.
Are the units noisy during operation?
People often worry about the noise a heat pump might make. Modern air-source models are generally quiet, but the honest answer is that it depends on siting, installation quality and how close the unit is to a neighbour’s window or boundary. Current statutory permitted development requirements include strict rules for noise and positioning to prevent disturbance. We carry out an MCS noise calculation as part of every design, which helps us position the unit to minimise any impact.
Heat pump questions regarding grants: How can I qualify?
Government incentives exist to encourage homeowners to invest in renewable energy solutions. The UK’s Boiler Upgrade Scheme (BUS) provides grants that are deducted from your installation cost upfront — you never need to claim them yourself.
- £7,500 for air-to-water heat pumps
- £2,500 for air-to-air models
- £9,000 for qualifying off-gas-grid properties replacing oil or LPG
Available until 31 March 2027. Your installer must be MCS-certified to apply on your behalf. Aspecte holds MCS number NIC-600167 and is a RECC member, so we are set up to handle this for you. Eligibility depends on property type, existing fuel, location and other conditions, so it is worth a conversation before you assume which figure applies to you.
How long does the installation process usually take?
In general, the installation of an air source heat pump requires around 2 to 3 days. This timeframe includes the removal of your previous heating system, the setup of the new pump and its requisite components, and the testing and commissioning of the system to verify that all parts are functioning correctly. Documented commissioning is a requirement under MCS installation standard MIS 3005-I:2025, not just a nice-to-have.
We strive to make the setup of your system smooth and easy, with as little disruption to your routine as possible. Our skilled technicians do all the installation work and take care of the details. They will also walk you through the controls and provide practical tips on getting the most from your new system — because clear handover and understanding your controls make a real difference to day-to-day performance.
Is planning permission required?
Air source heat pumps generally do not require planning permission, as they typically qualify as permitted development. However, rules changed on 29 May 2025 — the amended permitted development regulations introduced limits on the number and volume of units, and require compliance with the MCS noise calculation standard. Listed buildings and conservation areas still require a full planning application. If you have specific heat pump questions about your property type, it is always best to check with your local planning authority before proceeding.
We can help you work through the rules and make sure your installation meets them. Getting this right at the design stage avoids delays later.
Will the entire home’s windows, radiators, and plumbing need replacement?
Not necessarily. While air source heat pumps work most efficiently with modern heating systems, you may not need to replace all your radiators or plumbing. Heat pumps run at lower flow temperatures than gas boilers, so larger radiator surfaces help — but whether you need to change them depends on a proper heat-loss calculation for your home, not a blanket rule.
When it comes to windows, even heat-retaining double glazing isn’t absolutely necessary for a heat pump to work well. Instead, we perform a thorough assessment of your home and recommend any upgrades you might need for optimal system performance. That assessment follows MCS design standard MIS 3005-D:2025, which requires us to check building suitability and emitter sizing before specifying anything.
What kind of space is needed for the unit and cylinder?
The outdoor component of the system naturally requires sufficient space with unobstructed airflow. That usually means it’s installed against an exterior wall or in the garden. It’s about the size of a large suitcase. The indoor hot water cylinder takes up about the same space required for a traditional hot water tank. That often means the technology finds a home in an airing cupboard or a utility room.
Our site survey will assist you in determining the optimal sites for both the outdoor unit and the indoor cylinder. We also factor in the MCS noise siting requirements at this stage, so there are no surprises after installation.
Final Thoughts
Moving to an air-source heat pump is much more than a single switch; it’s a move toward a home that’s sustainable and energy-efficient. At Aspecte, we are MCS-certified (NIC-600167), RECC members, and Grant UK G1-approved installers — so we are accountable to independent standards at every stage, from design through to commissioning and aftercare. We help homeowners with that switch — if it’s right for them — with honest advice and quality installation.
If you have additional heat pump questions or want to explore whether an air source heat pump suits your home, please feel free to get in touch. We are more than happy to assist you throughout the entire process.
