Endorsed by Which?

AOS Energy Efficient Heating Systems Limited

4.9

240 Reviews

Opening Hours
Today -
  • 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
240 reviews
Customer Service
4.9
Quality
4.9
Value
4.8
Sort by
Heat Pump Installation
Customer Service
Quality
Value
Impressed with the team from AOS who installed our heat pump. Started and completed on time. Left our home clean and tidy each day. Very pleasant and polite. Guided us through the procedures required for the government grant. Assessed our home for the installation of new radiators, hot water tank and ASHP.
Customer in Cambridgeshire Posted on 14/06/2024 , work completed 17/05/2024
AOS Service
Customer Service
Quality
Value
Once again a very efficient and professional service provided by AOS, both back office and the service engineer. This appointment was rearranged at short notice and AOS went the extra mile to fit in this service. Clear summary of work done by a polite and friendly engineer who was clean and tidy in his work. All my questions were answered comprehensively. The previously high standard of service provided by AOS has been maintained and it is reassuring to know they support and maintain my heating system.
Customer in Bedford Posted on 12/06/2024 , work completed 11/06/2024
AOS Great Service
Customer Service
Quality
Value
I had quotes from British Gas and smaller companies than AOS and none met their price. They said the work would take 2-3 days as it was more than just a boiler replacement. The 4 man team run on site by Ryan completed, tested and commissioned the system in just under 2 days. Nothing was a problem for them even though a new bathroom was being fitted at the same time by a builder. Having been in construction all my life the standard of the installation was 100%. I would recommend them every time.
Customer in Hertfordshire Posted on 23/05/2024 , work completed 25/04/2024
Air source heating installation together with the replacement of all radiators - first class.
Customer Service
Quality
Value
Everything about this company instills customer confidence. The initial presentation was honest, factual and informative with absolutely no pressure selling whatsoever. The survey was extremely detailed and the proposal was clear, concise and well documented. As for the installation team, they were excellent. They arrived promptly each day and the first task each morning was to ensure that dust sheets were laid everywhere. Before leaving each day the dust sheets were removed and everywhere was vacuumed and the house was left in a pristine condition. This was repeated every day. The installation was extremely professional and the handover and operating instructions were detailed very clearly. In conclusion, a very experienced company that I would thoroughly recommend.
Customer in Essex Posted on 07/05/2024 , work completed 03/05/2024
New Boiler Installation
Customer Service
Quality
Value
I was fed up with British Gas. I had a service contract with them, and the last time they did a service they were in the house for ten minutes. I left British Gas and went to AOS on the recommendation of a friend. When it came to needing a new boiler, they were very impressive. Price was reasonable. They arrived on time - slightly early in fact. Put dust sheets everywhere. Completed the job in a day, were polite, courteous and knowledgeable. Very impressive. And I get a discount on my service contract too. First class, highly recommended!
Customer in Greater London Posted on 24/04/2024 , work completed 15/04/2024
AOS Heating
Customer Service
Quality
Value
We have recently had our boiler replaced by AOS heating following a power flush and service on our old boiler, which was constantly suffering from loss of pressure. We have found everyone that we have had contact with to be efficient, knowledgeable and great to work with. I would recommend them. I have scored them average on value as there are cheaper company’s out there but you get what you pay for.
Customer in Hertfordshire Posted on 24/04/2024 , work completed 22/04/2024
Great Service
Customer Service
Quality
Value
Called for assistance using our monthly plan with AOS. Great prompt service and Aidan who has visited us before was again excellent
Customer in Hertfordshire Posted on 23/04/2024 , work completed 23/04/2024
AOS heat pump
Customer Service
Quality
Value
I highly recommend the whole team from AOS for installing an air source heating system in our house. From the information given by Andy and Keith with no high pressure sales . We were given the facts and left to decide. The ladies Lucy and Josie in the office who are so kind and helpful keeping us informed of our government grant application. The team of engineers Rhys, Toby and others who were so polite and friendly. They did a superb job always checking that we were happy and explaining things. Whole system plus radiators and tank installed in 4 days. The system has been in a few weeks now and is working fine. Very happy with it. I like the offer of a free return visit to carry out a health check and to answer any of our questions in the first few months. Brilliant service
Customer in Central Bedfordshire Posted on 18/04/2024 , work completed 18/04/2024
Reliable, tidy and professional
Customer Service
Quality
Value
We have had an air source heat pump installed by AOS and they have done a great job. A polite team of up to six operatives who were tidy, hard working and professional. The pre-sales service was excellent too with regular communication as to what was going on and when things would happen. Happy to recommend them.
Customer in Hertfordshire Posted on 08/04/2024 , work completed 28/03/2024
AOS Heating Systems replaced my oil boiler central heating system for an Air Source Heat Pump including all radiators and hot water tank. system.
Customer Service
Quality
Value
A leaflet through my door from AOS Heating Systems resulted in a presentation on air source heat pumps and their advantages. This led to a 1 to 1 at home assessment. We had a 25 year old oil fired boiler feeding 40 year old radiators and decided now was the time to change. We went for the full system heat pump, new radiators throughout and replacement hot water tank. The installation took 5 days as predicted. The engineers were polite, totally professional arriving on time and cleaned up after themselves each day. There were some issues, the hot water tank, supplied by a sub-contractor was delivered late. However, AOS took complete responsibility. We were kept informed and pragmatic graceful solutions proposed and successfully implemented to keep the plan on track. We are delighted with the result. The heat pump itself is significant quieter (almost silent) than the oil fired boiler and although there is a little more humming from the system, as it is pumping water around the house, it is much quieter than the clicks and groans from the old system. Counter intuitively, the radiators are not as hot, but the house is definitely warmer than before. We have just booked our after sales health check to ensure we are fully familiar with our new system and using it as efficiently and effectively as possible. All in all, as a decerning engineer, I can say this was a major household change, managed really well by a totally professional team. I have no hesitation in recommending them.
Customer in Central Bedfordshire Posted on 04/04/2024 , work completed 22/03/2024