cosier.com

What It Is

Cosier is a UK-based residential air-source heat pump installation provider for homeowners looking to move away from gas or oil boilers. Its service area mainly covers London, Hertfordshire, Bedfordshire, Cambridgeshire, Norfolk, Suffolk, Essex, and nearby regions. According to its website, Cosier holds accreditations including MCS, HIES, BESCA, and Refcom, and can help customers apply for the UK Boiler Upgrade Scheme’s £7,500 heat pump grant.

Core Features

Cosier offers a fairly complete service workflow. Users first get a 2-minute preliminary estimate through an online questionnaire, followed by an in-home heat loss survey by a specialist. This includes measuring rooms, walls, doors and windows, insulation, radiators, pipework, and the outdoor unit location. Cosier then performs room-by-room heat load calculations, selects the heat pump, designs the hot water cylinder or Sunamp Thermino thermal battery setup, and provides a fixed-range quote. Installation typically includes the heat pump, hot water system, and required accessories; the site says it usually takes 3-5 days.

Pricing

Cosier does not offer a standard package price; quotes are based on the specific property. The heat loss survey and system design cost £200. If the customer proceeds with installation, this fee is deducted from the total installation cost. If they do not proceed, they can either keep the complete design documents within 30 days or request a refund of the £200. In terms of subsidies, the UK government’s Boiler Upgrade Scheme can deduct £7,500 from the cost. The website says typical homeowners usually still need to pay around £2,000-£7,000 after the grant.

Pros and Cons

The main advantages are a transparent engineering process and a strong emphasis on heat loss calculations and system design, rather than simply swapping out equipment. Its accreditations are relatively comprehensive, supporting both grant applications and consumer protection. The team background, phone contact, and responsibilities are also disclosed in reasonable detail. The downsides are that coverage is geographically limited and only suitable for homeowners in certain UK regions; final pricing can only be confirmed after a survey; and the site’s Features page includes placeholder copy related to AI voice products, which does not match the heat pump business and suggests there are still flaws in website content maintenance.

Who It’s For / Access from China

Cosier is best suited to homeowners in eastern and southeastern England who own detached homes or need to replace a boiler, especially those who want to apply for grants and care about installation quality and long-term energy efficiency. For users in China, the website is directly accessible, but the service is a highly localized offline installation business. Unless you own property in the UK, its practical value is limited.