AOS Energy Efficient Heating Systems Limited

We have been a long term customer of AOS and always happy with their service. When our old boiler reached its end-of-life, (supplied and installed by AOS nearly 20 years ago), AOS provided a competitive quote for a replacement, offered an installation date within a few days, arrived on time, carried out a nice neat installation, tested and talked us through the new boiler operation. Engineers always very personable and ready to answer questions and listen to any concerns.

I totally recommend AOS if you’re thinking of installing a Heat Pump. From start to finish I had complete trust in the company and I must also give a mention to Ryan and his team who installed the pump over four days. They were knowledgeable, punctual, pleasant and cleared up every day.

The service provided was very professional and thorough. Prior to installing a new boiler, the engineers tried very hard to mend the previous one. Sadly it wasn’t to be and the decision to replace was made. Having been without heating for several days, the company strived for a quick installation to minimise our discomfort. The installation went smoothly, the workmen were very careful and respectful of my brand new floor. They worked quickly and efficiently, clearing up after themselves. We are delighted by the service that AOS provides and have no hesitation in recommending this company for both maintenance and installation of heating equipment.

We had been thinking about changing from oil fired heating to an Air Source Heat Pump, and decided on using AOS following a recommendation from a neighbour and reading very positive reviews online. The whole process was so simple with AOS staff giving us advice on preparing the house, applying for the RHI grant etc. The work was carried out in 4 days and I was delighted by how efficient and clean the engineers were. Our new heating is fantastic and we’re delighted - many thanks to our engineers and to Lucy and Charlotte in the office

Installing a heat pump is more complicated than a boiler but AOS were extremely supportive and professional through this process. All the staff I encountered had the same helpful attitude and the standard of the final work was exceptional. First time a plumber has labelled all the consumer facing switches and sockets. Great support with the associated paperwork as well. Very strongly recommend.

AOS installed an air source heat pump. Initial visits were made to ensure we understood the system and how it would work for us. A survey was done with recommendations on what alterations were needed to our existing radiators and hot water tank. No pressure was put on us to go ahead with the work with the result that we had time for reflection. Questions that we had were always answered promptly. An installation date and price were agreed and both were adhered to. The installation team arrived promptly, were knowledgeable, polite, competent and hard working. Once installed, the system was explained fully to us, with a number to phone if there was a problem. There were none and we don't expect there to be, but are confident that AOS will be there for us in that unlikely event.

We contacted AOS on 11th January this year for an initial enquiry about an air source heat pump installation at our house. I had found them on the Which Trusted Traders site and subsequently received a very positive recommendation from a friend who had a heat pump installed by them. From my initial call through to completion of the installation today, we have found the company a pleasure to deal with. Based on our EPC information the staff were able to send me an initial proposal, with some options for us to consider re-replacement of radiators and hot water tank. This document also gave us a very good idea of the whole process but was subject to a full site survey. The surveyor did a very thorough job, explained everything to us clearly and after some further discussions we were sent a firm proposal, which was again thorough and set out all the costs, payment terms and other considerations very clearly. On accepting the proposal a date was arranged for the installation as soon as possible to give us time to apply for the RHI scheme. The installation team arrived at 8am 'on the dot' and completed the complex operation over three and a half days in a highly professional manner, taking great care to protect the flooring and clean up thoroughly after each day's work. I am confident that the after sales service will be as good as our experience with AOS so far suggests, and we would thoroughly recommend this company to anyone considering a heat pump installation.

I was recommended AOS by a friend who had used AOS for the installation of her heat pump, and I am totally satisfied with her recommendation. When I expressed an interest in AOS, someone came to explain what would be involved and when I said I wanted to go ahead, I paid a deposit and someone came to do a full heat-pump survey. I accepted the recommendations of installing new radiators and work started in January. I was told it would last about three days and it did. The men who came seemed very efficient, hard-working, competent and polite and were easy to have around the house. When a different trade, e.g. an electrician was needed he came on time, so there was no hold up. The workmen tidied up each evening and vacuumed thoroughly. I have now been left the paperwork for applying for the RHI. A firm to be thoroughly recommended.

Compared three three air source heat pump installers, one wanted £471 for a survey which would only be taken off the final bill not leaving us with a choice of supplier and they quoted without visiting the property, the second visited and quoted but was a Daikin supplier and the estimated RHI funds would of been lower. The first company also estimated RHI higher than AOS because they quoted a system with higher water temperature. AOS stated they would install at 45 degrees and guarantee temperatures as per the heating engineer survey so the RHI estimate was higher. So we went ahead over four days they removed the old LPG boiler installed the heat pump replaced most radiators and upgraded our electric RCD unit. We had some small issues with the plastering, a leaky value and fine tuning the bathroom temperature but AOS quickly return and fix all these issues. The actual RHI was a just few pence lower than estimated, but significantly higher than other estimates and the one off payment replacement scheme coming in March. The RHI will greatly assist with the electricity bills over the next seven years. So AOS was not perfect but very good and delivered. I was concerned about, reaching the temperatures in the rooms, the hotness of the hot water and the energy consumption. Most rooms exceed targets and the values are turned down, the bathroom makes the target of 20 degrees, now adjustments have been made. The hot is piping hot, the energy consumption seems about right.

Our boiler failed terminally on Boxing Day 2021. We knew our old boiler & pipe work were non standard & more often found in commercial properties & so several companies declined to help. Initial contact with AOS over the Xmas & New year holidays was understandably slow but on Tues 4th Jan 2022 they gave me a survey date of Thur 6th Jan. They arrived on time and despite the unusual setup seemed happy to take on the job & a quote arrived the same day. We feared the worst but it was very reasonable. Work began on 11th Jan & the 1.5 day estimate took 2 days due to the complexity. We are very happy with the result. The engineers were polite, tidy, explained what they were doing & why, took away the old boiler and all rubbish & cleaned up well. They replaced several items they had not specifically quoted for at no extra cost and clearly explained the operating instructions. There were two things that perhaps could have been better. The first was a little confusion over the removal of the old roof flue and tile repair. We thought the engineer said they would do that but it turns out there was some miscommunication & they recommended it be done by a roofing specialist to ensure integrity of the roof tiling. Once explained it was clear & made sense. The other minor issue was we thought the wall filling where the old timer control was removed could have been better.