Endorsed by Which?

AOS Energy Efficient Heating Systems Limited

4.9

254 Reviews

Opening Hours
Today - 08:00–17:00
  • Monday 08:00–17:00
  • Tuesday 08:00–17:00
  • Wednesday 08:00–17:00
  • Thursday 08:00–17:00
  • Friday 08:00–17:00
  • Saturday - Closed
  • Sunday - Closed

What is a Which? Trusted Traders Hertfordshire Trading Standards Approved Endorsement?

Which? Trusted Traders has partnered with Hertfordshire Trading Standards to create a Hertfordshire Trading Standards Approved endorsement. In addition to our standard trading standards assessment, this trader has had a DBS check and is subject to a Trading Standards intelligence check

About

AOS Heating has been one of the industry's leading experts in the Heating & Boiler industry for over 36 years.
Established in 1984, AOS are family run business who is proud of the reputation we have accomplished over the years.
AOS are a trusted company due to our outstanding customer service record, not only do we provide an honest, reliable service we also offer first class central heating, electrical & plumbing services for all.
Whether you need repairs or servicing to an existing heating system or you are interested in a completely new central heating installation we'll make sure you get the best results.
What's more AOS are also specialists in the most up-to-date heating advancements, including renewable & green technologies such as the latest energy efficient boilers and air source heat pumps. Whatever the job, you can rest assured that you are in expert hands.

What we do

  • Plumbers

    • Emergency plumbing services
    • Unvented cylinder installation and maintenance
  • Boiler, central heating and gas engineers

    • Boiler installation
    • Boiler repair
    • Boiler servicing
    • Radiators and central heating
    • Gas safety testing and inspection
  • Renewable energy

    • Air source heat pumps

Customer reviews

Why you can trust these reviews

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4.9
254 reviews
Customer Service
4.9
Quality
4.9
Value
4.8
Sort by
Boiler replacement
Customer Service
Quality
Value
AOS priced to remove the existing boiler and associated tanks and pipes and replace with a new boiler The work was over two days and went to schedule and price The engineers were tidy and professional and explained what they were doing as the job went along Handover of the new boiler and working instructions was comprehensive All in all, I was impressed
Customer in Greater London Posted on 26/11/2024 , work completed 22/11/2024
Lightbulb Moment
Customer Service
Quality
Value
The very old light fitting in the dining area was rarely used. It was connected to an equally old dimmer switch. When a family member came to change a bulb recently it went pop and nothing worked. I didn’t know of a reliable electrician so I rang AOS, the company that have been my “go-to” as they fitted my new boiler recently and several other similar jobs. They recommended Luca. I said I didn’t need a dimmer switch and was given a price for the job and a date so when Luca, the electrician from AOS, arrived in a smart uniform and cheerful face I was very relieved. He quickly assessed the situation and replaced the dimmer with a standard on/off switch. Due to arthritis, I have been unable to get on step ladders so the glass shades were looking extremely grubby. Luca very kindly removed the shades and while I was washing them in the kitchen, he wiped the light fitting all over and replaced the three glass shades and put in the bulbs I’d got in readiness. It’s really lovely and bright now and I am so grateful for his kindness and help. Thank you!
Customer in Essex Posted on 13/11/2024 , work completed 11/11/2024
Superb Experience of new Air Source Heat Pump
Customer Service
Quality
Value
Deciding to switch to Air Source Heating was a significant one. Despite the mixed opinions we encountered, our research and understanding led us to believe that it was the right choice for us. We’re delighted with the installation and the system’s performance. From the informative sales pitch to Lee’s helpful survey and installation assistance and the highly skilled work of Ryan, Sam, and Luca (who are perfectionists and passionate about the quality of work they do and are a true asset to your company), the entire process was first-class. The quality of the installation is truly impressive, and the overall customer experience is top-notch. Please extend our heartfelt thanks to all of them.
Customer in Cambridgeshire Posted on 08/11/2024 , work completed 28/10/2024
Great Professional Job
From the village hall meeting where AOS gave background info on heat pumps and exploded some of the myths around them, to the quotation process, survey and then installation they have been superb. A great local company with bags of expertise in retrofitting heat pumps to all types of properties. I have delayed my review to see how the heat pump performed as the weather got colder. All I can say is that so far the house is warmer, the costs vs oil are lower and so we are very happy in taking the plunge to this method of heating and hot water. Check out Octopus Energy for some very innovative heat pump tariffs. Overall the experience has been excellent and I have no hesitation in recommending AOS. First-class job from a local company.
Customer in Cambridgeshire Posted on 06/11/2024 (Reviewer did not use service)
Installation of Air Source Heat Pump
Customer Service
Quality
Value
AOS have an excellent team in all departments of the office and in the engineers who visit to carry out the work installing our Air Source Heat Pump. We were cared for throughout the process, from the initial survey to the completion of the installation and arrangement of the aftercare package to maintain the system. The onsite team were friendly, knowledgeable and hard-working. They took care each day to leave us with hot water for showers and a clean tidy home. AOS installed and maintained our previous gas boiler so efficiently for 15 years that we were 100% confident to ask them to install our new system.
Customer in Central Bedfordshire Posted on 05/11/2024 , work completed 14/10/2024
AOS Heating Systems Fitting Air Source Heat Pump
Customer Service
Quality
Value
AOS removed our old gas boiler and installed an air source heat pump. The process was to take 4 days Monday to Thursday. Day 1 Drain the old system, remove the old boiler, and remove some of the older radiators. Chop out a lot of the old pipework. Day 2 removed the old hot water cylinder and site the new Heat pump and pipework. By the end of the day, we were left with hot water from the new cylinder. Happy days. On day 3 Luka carried out electrical work to connect the heat pump. By the end of the day, the heat pump was running and supplying both hot water and heating. Day 4 made good all holes from the old system to a very high standard, from the outside you would never know the brickwork had been drilled. By lunchtime the guys cleaned up and ran me through the new tech, installing the app and left me fully understanding the new system. We were very lucky to have Sam and his apprentice Louis. Their work was of exceptional standard, very tidy, self-motivated, respectful of our property and explained everything as they went about their work. When Sam and Louis left everything was lovely and tidy. In short, the whole experience was good from the start, from working with Jack in the planning and the rest of the team. I had been dreading the upheaval as this was a complete system change. I shouldn’t have worried the team were brilliant ensuring we were warm after they left in the evening. I truly recommend if you are considering any work with this very professional team. 👍🏼
Customer in Hertfordshire Posted on 24/10/2024 , work completed 24/10/2024
New ASHP based heating system
Customer Service
Quality
Value
Right from the initial engagement through to completion AOS Heating's communications and professional approach shone through. They designed a heating system as a total entity for my house that has proved to be a major improvement on my previous oil-based system. The house is evenly warm, hot water is produced in quickly and my energy consumption looks to be down based on the first month of use. This demonstrated that a system like this needs to be properly designed for a property. During the installation AOS staff were respectful, polite, and very tidy, causing minimal disruption to the house. A good indicator of the quality of a service is their approach to sorting snags, there were a couple of small snags which were corrected very quickly and efficiently. I would thoroughly recommend AOS Heating and will be engaging them for ongoing system maintenance.
Customer in Essex Posted on 23/10/2024 , work completed 20/09/2024
Boiler Installation
Customer Service
Quality
Value
Very pleased with the new boiler installation work. Efficient workers, polite and clean and tidy. Would recommend them to Friends and Family.
Which? Trusted Traders Consumer Posted on 22/10/2024 , work completed 04/10/2024
Heat pump installation
Customer Service
Quality
Value
The team were excellent throughout the whole process. There was clear communication and updates during the process from survey to installation. During installation the team were professional, prompt and left the house in an excellent condition. The installation was incredibly neat.
Customer in Hertfordshire Posted on 07/10/2024 , work completed 03/10/2024
Good Reliable Company
Customer Service
Quality
Value
The original installation of an Air Source Heat Pump and new radiators was carried out earlier this year. The few teething problems we had at the time were sorted out quickly and efficiently by the companies engineers. This visit was to address a couple of minor leaks on the newly installed radiators, the engineer who came has been before and was polite efficient and knowledgeable, he fixed the radiators and checked the system and also helped us with changing the timings on the control panel. All of the employees of AOS have been polite and considerate when visiting our property.
Customer in Hertfordshire Posted on 03/10/2024 , work completed 02/10/2024