HEAT PUMP FAQS

If you’ve got a question about air source heat pumps, you’re in the right place to get answers on all things ASHP related.

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GOT QUESTIONS ABOUT ASHPS FOR YOUR HOME OR BUSINESS?

You’re not alone. At Harvard Renewables, we work with customers across Greater London, Essex and Kent every day, and we know that choosing solutions like heat pumps for energy-efficient heating can raise plenty of questions.

We’re here to give you clear, straightforward answers to the most common queries we’re asked by local homeowners and businesses.

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WE DISCUSS YOUR ASHP QUESTIONS

To help answer some of the most common questions and concerns around air source heat pumps, our directors Bo and Billy have put together a short series of videos drawing on their hands-on experience installing systems across Greater London, Essex and Kent.

In these videos, they talk openly and honestly about the issues customers ask us about most, giving you clear, practical insights to help you decide whether an air source heat pump is right for your home, or business.

WHAT IS AN ASHP?

ARE ASHP’S NOISY?

DO ASAP’S NEED LOTS OF SPACE?

DO I NEED PLANNING PERMISSION?

ARE ASAP’S EXPENSIVE?

HOW MUCH MAINTENANCE IS NEEDED?

CAN ASAP’S BE RETROFITTED?

DO ASHP’S ACTUALLY WORK?

FREQUENTLY ASKED QUESTIONS

How does an air source heat pump work?
Air source heat pumps absorb heat from the air using a fan and refrigerant system, then compress and transfer that heat into your home through radiators, underfloor heating and a hot water cylinder.
Are air source heat pumps suitable for homes in Greater London, Essex and Kent?
Yes. Air source heat pumps perform very well in the UK climate and are suitable for most properties across Greater London, Essex and Kent, including both new builds and existing homes.
Can I get a free heat pump survey?
Yes. Harvard Renewables offers free, no-obligation heat pump surveys to assess your property, heating requirements and suitability for an air source heat pump.
How efficient is an air source heat pump?
Air source heat pumps are highly efficient, typically producing 3–4 units of heat for every 1 unit of electricity used, making them far more efficient than traditional heating systems.
Will an air source heat pump keep my home warm in winter?
Yes. Modern air source heat pumps are designed to operate efficiently in low temperatures and provide consistent, comfortable heating throughout the winter months.
Do I need to change my radiators for a heat pump?
Not always. Some homes may need larger or additional radiators to work most efficiently with a heat pump. This is assessed during your free survey.
Can an air source heat pump work with underfloor heating?
Yes. Air source heat pumps work particularly well with underfloor heating systems due to their low-temperature, steady heat output.
Are there grants available for air source heat pumps?
Yes. Many homeowners are eligible for government funding such as the Boiler Upgrade Scheme, which can significantly reduce installation costs. We can advise you during your survey. Find out if you are eligible for a grant.
How long does it take to install an air source heat pump?
Most installations are completed within a few days, depending on the complexity of the system and any upgrades required.
Can an air source heat pump replace my gas or oil boiler?
Yes. Air source heat pumps can fully replace gas, oil or LPG boilers, providing both heating and hot water.
How much can I save on my energy bills with a heat pump?
Savings vary depending on energy tariffs, insulation levels and system design. Many households see lower running costs, particularly when switching from oil or LPG.
Do air source heat pumps need servicing?
Yes. Annual servicing is recommended to keep your system running efficiently and to maintain warranties.
Are air source heat pumps environmentally friendly?
Yes. Air source heat pumps significantly reduce carbon emissions and support the UK’s move towards low-carbon heating.