OHM Energy Limited
Hertfordshire
MCS certificate NAP-14646 · Verify on MCS
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What customers say on
We had solar panels removed around make space for a velux window. The initial quote was £476, with reassurance that if the work took longer it would only be “slightly more”. However, the final bill came in at almost double this amount, and we were not contacted on the day to advise that costs were escalating or to seek approval before the work was completed. That said, communication during the dispute itself was polite and professional, and once we raised our concerns the company did engage constructively. They acknowledged that the wording used in the estimate was unhelpful and ultimately agreed to a reduced and more reasonable final price, which we appreciated. The work itself was completed, and while we were unhappy with how the pricing was handled initially, we were pleased that the matter was resolved amicably in the end. Clearer communication around estimates and cost overruns would significantly improve the experience.
A very positive experience. OHM installed an Air Source Heat Pump in May 2025. The whole process from initial survey to completion was friendly, professional and efficient. We are very happy with the quality of the work and would recommend OHM to anyone considering a heat pump.
A challenging task was tackled expertly by this company. The team of Russell, Simon, Henry, Gino, Adam, and Josh were cheerful and skilled in replacing all the radiators, siting the pump and squeezing the cylinder into a small space. A new shower was fitted very neatly. Everything is now in place and working. It's too soon to tell if the system will cope with cold weather, but so far so good. I can recommend OHM Energy as a heat pump installer.
It has been a pleasure dealing with Paul, Emma, Ollie and Keith at OHM. I have had a ground source heat pump installed by them aswell as PV panel system. The work was prompt and efficient but in particularly the after sale service and customer care is excellent. It is a big outlay and they always take time to answer questions and queries. Saving up for my Powerwall battery now and will be using these guys!
OHM fitted an air source heat pump for us- It was a slightly tricky install into a fairly tight space that Octopus energy had said that they couldn't do. They came with the creative thinking required to route the pipework as straight forwardly as possible and fit a slimline cylinder into our smaller space. It was a 4 day job on the heat pump install with an extra day beforehand to upgrade some radiators. All the team were polite, professional and communicative. We are happy with the outcome.
What customers say on Trustpilot
Tres bon interlocuteur
Tres bon interlocuteur , tres agreable
Super merci
Super merci
OHM, a great job
OHM are quick to respond and do what they say they will do. Professional and friendly. A great job ! thanks
I was satisfied with her help
I was satisfied with her help, she explained to me in a way I can understand
Heat pump installation
A challenging task was tackled expertly by this company. The team of Russell, Simon, Henry, Gino, Adam, and Josh were cheerful and skilled in replacing all the radiators, siting the pump and squeezing the cylinder into a small space. A new shower was fitted very neatly. Everything is now in place and working. It's too soon to tell if the system will cope with cold weather, but so far so good. I can recommend OHM Energy as a heat pump installer.
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FAQs About OHM Energy Limited
Yes. OHM Energy Limited is registered under the Microgeneration Certification Scheme (MCS) (certificate number NAP-14646). MCS certification is required for your installation to qualify for the Smart Export Guarantee (SEG) and confirms the work meets recognised UK standards for safety and quality.
OHM Energy Limited serves Hertfordshire and 11 other counties across the UK. You can see the full list of counties covered on this profile.
OHM Energy Limited installs Solar PV, Heat Pumps. Every project should include a free survey, a detailed written quote, and installation by MCS-certified engineers.
OHM Energy Limited holds a Google rating of 4.7 out of 5 from 75 reviews. You can read reviews and compare against other installers in Hertfordshire on this page.
A typical 4kW domestic solar PV system in the UK costs around £6,600 to £8,500 installed, with a payback period of roughly 11 to 13 years. Your exact price depends on system size, roof type, and whether you add battery storage. Compare quotes from installers covering Hertfordshire to get accurate figures for your home.
Yes. OHM Energy Limited installs air source heat pumps in Hertfordshire. A typical air source heat pump installation costs around £8,000 to £14,000 before any grant. In England and Wales the Boiler Upgrade Scheme offers a £7,500 grant towards the cost, which an MCS-certified installer can apply on your behalf.
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