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LEETHERM Home Energy Upgrades
SEAI registered One Stop Shop for Deep Retrofits
Insulation, Heating, Construction

If you’re planning new windows and wall insulation, the order matters.In many retrofit projects, it’s best to do windows...
15/10/2026

If you’re planning new windows and wall insulation, the order matters.

In many retrofit projects, it’s best to do windows first, then insulate the walls.

Why?

Because it makes it easier to integrate the window properly with the insulated wall build-up - helping reduce weak points around the opening (where heat loss and water ingress can become issues if detailing is poor).

👉 We explain what this looks like in practice (and what to ask your installer) in the full blog: https://leetherm.ie/windows-and-doors-the-final-piece-of-your-home-energy-puzzle/

🚪 Windows and doors are often treated as a “quick win” upgrade - but in a retrofit, they’re really the final piece of th...
08/10/2026

🚪 Windows and doors are often treated as a “quick win” upgrade - but in a retrofit, they’re really the final piece of the puzzle.

We’ve just published a new blog post on when to upgrade, what to look for in a quote (without getting buried in jargon), and why installation detail matters as much as the product you choose.

👀 Read it here: https://leetherm.ie/windows-and-doors-the-final-piece-of-your-home-energy-puzzle/

Last Friday, we had the pleasure of welcoming Minister for Public Expenditure, Infrastructure, Public Service Reform and...
02/10/2026

Last Friday, we had the pleasure of welcoming Minister for Public Expenditure, Infrastructure, Public Service Reform and Digitalisation Jack Chambers, TD Michael Murphy, and Senator Imelda Goldsboro to Leetherm HQ.

They dropped in to see how retrofit projects are managed behind the scenes - from customer enquiries and grant support to scheduling, coordination, and delivery on site.

We also shared feedback on how SEAI grants are helping homeowners take the next step with energy upgrades. It was great to have the opportunity to share what we’re seeing day-to-day across retrofit projects.

Thanks again for taking the time to visit!

⭐ ⭐ ⭐ ⭐ ⭐𝗧𝗵𝗲𝗿𝗲'𝘀 𝗻𝗼𝘁𝗵𝗶𝗻𝗴 𝗺𝗼𝗿𝗲 𝗿𝗲𝘄𝗮𝗿𝗱𝗶𝗻𝗴 𝘁𝗵𝗮𝗻 𝗵𝗲𝗮𝗿𝗶𝗻𝗴 𝗳𝗿𝗼𝗺 𝗵𝗮𝗽𝗽𝘆 𝗵𝗼𝗺𝗲𝗼𝘄𝗻𝗲𝗿𝘀.From being praised for our excellent service ...
24/09/2026

⭐ ⭐ ⭐ ⭐ ⭐

𝗧𝗵𝗲𝗿𝗲'𝘀 𝗻𝗼𝘁𝗵𝗶𝗻𝗴 𝗺𝗼𝗿𝗲 𝗿𝗲𝘄𝗮𝗿𝗱𝗶𝗻𝗴 𝘁𝗵𝗮𝗻 𝗵𝗲𝗮𝗿𝗶𝗻𝗴 𝗳𝗿𝗼𝗺 𝗵𝗮𝗽𝗽𝘆 𝗵𝗼𝗺𝗲𝗼𝘄𝗻𝗲𝗿𝘀.

From being praised for our excellent service from start to finish to being described as easy to deal with and professional, we're proud to make the retrofit journey as smooth and stress-free as possible.

One recent customer summed it up perfectly:
"A professional company that take the stress away from the householder.”

Thank you to everyone who takes the time to share their experience. Your feedback means a lot to our team and motivates us to continue delivering the highest level of service every step of the way.

Thinking about upgrading your home? Get in touch and let us help make the process simple from start to finish.
www.leetherm.ie/oss

Do you need a battery with Solar PV?Not always - but for some homes it can be a great add-on, especially if you’re insta...
17/09/2026

Do you need a battery with Solar PV?

Not always - but for some homes it can be a great add-on, especially if you’re installing 4kW+ and you have the budget to include battery costs as part of the overall upgrade.

A battery can help you store surplus electricity generated during the day so you can use it later (for example, in the evening).

Leetherm delivers Solar PV as part of wider retrofit or home energy upgrade projects - get in touch today if you’re planning to upgrade your home and want to understand whether solar PV makes sense for you 👉 www.leetherm.ie/oss

“How big a Solar PV system do I need?” is one of the first questions homeowners ask.In many retrofit projects, 4kW is a ...
10/09/2026

“How big a Solar PV system do I need?” is one of the first questions homeowners ask.

In many retrofit projects, 4kW is a very common system size - largely because it suits the average roof space. Anything bigger usually comes down to the available space on your roof (plus orientation and shading).

We’ve covered sizing, performance factors, and what to consider before you decide:

Find out more 👉 https://leetherm.ie/solar-pv-in-ireland-2026-what-it-does-what-size-most-homes-need-and-how-it-fits-into-a-retrofit/

Thinking about adding Solar PV as part of your retrofit? 🌞It’s one of the most popular upgrades in Ireland right now - b...
03/09/2026

Thinking about adding Solar PV as part of your retrofit? 🌞

It’s one of the most popular upgrades in Ireland right now - but it’s easy to get lost in the jargon (and to confuse Solar PV with the older solar thermal systems).

In our latest blog, we explain Solav PV in plain English: what it does, how it fits into a retrofit plan, and what to expect on timelines.

👀 https://leetherm.ie/solar-pv-in-ireland-2026-what-it-does-what-size-most-homes-need-and-how-it-fits-into-a-retrofit/

𝟱-𝘀𝘁𝗮𝗿 𝗳𝗲𝗲𝗱𝗯𝗮𝗰𝗸 𝗳𝗿𝗼𝗺 𝗼𝘂𝗿 𝗰𝗹𝗶𝗲𝗻𝘁𝘀⭐ ⭐ ⭐ ⭐ ⭐We’re incredibly grateful for the kind words from our recent clients.From being...
27/08/2026

𝟱-𝘀𝘁𝗮𝗿 𝗳𝗲𝗲𝗱𝗯𝗮𝗰𝗸 𝗳𝗿𝗼𝗺 𝗼𝘂𝗿 𝗰𝗹𝗶𝗲𝗻𝘁𝘀
⭐ ⭐ ⭐ ⭐ ⭐

We’re incredibly grateful for the kind words from our recent clients.

From being described as “complete pros from the start” to “very efficient” and “great company to deal with”, it’s rewarding to know our approach is making a difference.

What stands out most is the trust behind comments like “was recommended by the neighbour”, “they had all the grant funding sorted”, and “real can-do attitude.”

Thank you to everyone who has taken the time to leave a review. Your feedback means a lot to the entire Leetherm team. 🙌

Quick myth-buster: making your home more airtight doesn’t mean it can’t be healthy.A comfortable home isn’t one that rel...
20/08/2026

Quick myth-buster: making your home more airtight doesn’t mean it can’t be healthy.

A comfortable home isn’t one that relies on random draughts - it’s one with controlled ventilation. That’s so important because everyday life creates moisture (showers, cooking, drying clothes), and without the right ventilation strategy, that moisture can lead to condensation and, in some cases, mould.

In our latest blog, we explain why ventilation becomes even more important after airtightness upgrades, and how the right system helps protect comfort and indoor air quality.

Learn all about it here: https://leetherm.ie/ventilation-in-retrofits-dcv-explained-and-why-its-even-more-important-after-upgrading/

What is Demand Control Ventilation (DCV) - and why is it so common in retrofits?DCV is designed to respond to what’s hap...
13/08/2026

What is Demand Control Ventilation (DCV) - and why is it so common in retrofits?

DCV is designed to respond to what’s happening in your home (for example, changes in humidity), rather than ventilating at one fixed rate all day. In simple terms: it helps remove stale, moist air when it’s needed most, and supports healthier indoor air day-to-day.

For many retrofit homes, DCV can be a practical fit because it delivers strong ventilation outcomes without the same level of disruption some other systems can require.

We’ve broken down how DCV works, what it helps with, and what to consider in your own home here: https://leetherm.ie/ventilation-in-retrofits-dcv-explained-and-why-its-even-more-important-after-upgrading/

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