As Ireland pushes towards a more sustainable and carbon-neutral future, the conversation around home heating is heating up too. One technology at the centre of that discussion is the heat pump, a low-carbon, highly efficient alternative to traditional oil and gas boilers.

But with change comes scepticism, and heat pumps are no exception. From concerns about performance in damp climates to misconceptions around cost and suitability, several myths persist.

In this blog, we take a deep dive into the most common heat pump myths in Ireland, backed by facts, real-world examples, and expert insight from the team at Mastertherm Ireland.

What Is a Heat Pump, Really?

Before diving into the myths, it’s worth revisiting the basics. A heat pump is a renewable heating system that extracts heat from the air, ground, or water outside your home and transfers it indoors to heat your space and water.

There are different types, air source, ground source, and water source but they all work on the same principle: using a small amount of electricity to move heat from one place to another, rather than generating it by burning fossil fuels.

Myth 1: Heat Pumps Don’t Work in Cold or Wet Climates

This is perhaps the most widespread myth in Ireland, where our winters are damp, grey, and chilly, but rarely freezing. The concern is that heat pumps lose efficiency in low temperatures, especially in comparison to conventional boilers.

The Truth:

Modern inverter-driven heat pumps, like those offered by Mastertherm, are specifically designed to work efficiently even in sub-zero conditions. In fact, air source heat pumps can operate efficiently in temperatures as low as -20°C, which is much colder than anything the Irish climate throws our way.

Moreover, Ireland’s temperate maritime climate is actually quite favourable for heat pump performance. Our winters are mild compared to many other countries where heat pumps are popular (like Sweden, Norway, and Canada).

Myth 2: Heat Pumps Are Too Expensive to Install

Yes, heat pumps can involve a higher upfront investment compared to a standard gas boiler. This can be a sticking point for many homeowners, especially those comparing only initial costs.

The Truth:

While installation costs can vary depending on the property and system type, SEAI grants are available to help significantly reduce the cost for eligible homes. Grants of up to €6,500 are available under the SEAI heat pump system grant, making the switch much more affordable.

And don’t forget the long-term savings. Because heat pumps are far more efficient than fossil fuel systems, your energy bills are likely to decrease over time, especially in well-insulated homes.

ROI typically occurs within 5–10 years, depending on usage and system design. And given that a high-quality heat pump system can last over 20 years, the savings stack up.

Myth 3: You Need a New-Build or Ultra-Modern Home for a Heat Pump

Many people assume that heat pumps are only suitable for new homes or properties built to Passive House or A-rated energy standards.

The Truth:

While insulation and airtightness do impact efficiency, modern heat pump systems are incredibly adaptable. Retrofitting older homes is increasingly common across Ireland. The key is ensuring the home is reasonably insulated and that the system is properly sized and designed.

At Mastertherm, we conduct comprehensive heat loss surveys to ensure the heat pump system is tailored to your specific home, whether it’s a 1950s bungalow or a new A-rated build.

Additionally, hybrid systems or zoned heating options make it easier to integrate heat pumps into existing properties without needing a complete overhaul.

Myth 4: Heat Pumps Only Work with Underfloor Heating

Underfloor heating and heat pumps are a perfect match, as both operate at lower temperatures than traditional radiators. But the myth that you must have underfloor heating to use a heat pump is false.

The Truth:

While underfloor systems are ideal, heat pumps also work with low-temperature radiators, which are now readily available and cost-effective to install. Many Irish homeowners choose to upgrade their existing radiator systems during a retrofit to optimise performance.

At Mastertherm, we’ve installed plenty of systems with a mix of underfloor heating downstairs and radiators upstairs striking the perfect balance between comfort and practicality.

Myth 5: Heat Pumps Are Noisy

Some worry that outdoor heat pump units will disrupt their peaceful garden or sound like a jet engine outside their window.

The Truth:

Modern heat pumps are surprisingly quiet. Most outdoor units produce around 40–50 decibels, which is comparable to a quiet conversation or the hum of a refrigerator.

Furthermore, careful installation can minimise any potential disruption. Proper placement and sound-dampening mounts mean most homeowners don’t even notice their heat pump is running.

Myth 6: You’ll Constantly Run Out of Hot Water

Another persistent myth is that heat pumps struggle to provide enough hot water, especially for larger households.

The Truth:

Modern heat pump systems include dedicated hot water cylinders that are designed to work efficiently with your system. These cylinders are well-insulated and sized appropriately for your family’s needs.

Plus, smart controls allow for scheduling, boost functions, and even solar PV integration, meaning you can enjoy abundant hot water and energy savings—without compromise.

Myth 7: Heat Pumps Are Complicated to Use

A lot of people fear the tech side of things, especially with talk of “smart controls,” apps, and automation. The assumption is that managing a heat pump is like programming a spaceship.

The Truth:

Heat pumps can be as simple or as smart as you want them to be. Mastertherm’s systems are designed for user-friendliness. Basic control panels let you adjust temperature and schedules with ease, while smartphone apps allow for remote control and energy monitoring for those who want more oversight.

Better still, once set, most heat pump systems can run automatically, adjusting to your comfort needs with minimal input.

So, Are Heat Pumps Worth It in Ireland?

Let’s weigh the key facts:

Proven Performance in Irish Climate

Ireland’s mild winters make it well-suited to air and ground source heat pumps, which operate effectively even in colder and wetter conditions.

Lower Running Costs Over Time

While installation requires investment, the savings on heating bills and available grants help balance the cost over time.

Low Maintenance, Long Lifespan

With proper servicing and use, a quality heat pump can last 20+ years and requires less maintenance than traditional boilers.

Massive Environmental Benefits

Heat pumps can reduce your home’s carbon emissions by up to 60%, especially if paired with renewable electricity sources like solar PV or a green energy provider.

Final Verdict

The verdict is clear: Yes, heat pumps are worth it in Ireland’s climate.

With government backing, smart design, and the right installer, heat pumps offer a cleaner, cheaper, and more comfortable way to heat your home. At Mastertherm, we’re here to guide you through the journey, from initial assessment to full installation and ongoing support.



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