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RDI are a respected and established company operating in the Highlands from our base in Thurso. For over a decade we have designed, installed and serviced accredited modern high efficiency energy systems. Our services encompass domestic to estate and commercial applications and we have demonstrable reference systems throughout the Highlands.

If you need or want serviced: biomass, solar thermal, heat pump, under-floor and traditional oil & gas heating, multi-fuel stoves and photovoltaics, contact us here, we'll do our best!

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General Info about Heat pumps

Heat pumps are a great way get your heating bills under control and can provide you with heating and hot water at an affordable cost. RDI Renewables work in partnership with Panasonic for heating & cooling systems.


There are several different types of heat pump on the market, air source (air-to-air), water source, and ground source (geothermal). RDI Specialises in air-to-air as it is more suitable and more economical for the retro-fit market that we serve. All heat pumps work on the basic principle of moving heat energy from a source of heat to what is called a heat sink (e.g. from outside the house to the inside to warm or cool the inside). Air source heat pumps use a refrigeration cycle (like your fridge or freezer using a compressor), even if it is -20c outside Panasonic say their heat pumps can still pull enough heat out of the air to heat a home. The benefit of this is that you only pay to operate a compressor inside the heat pump to transfer the heat from outside but this only uses a very small amount of energy. A typical example of a Panasonic heat pump would be the compressor using 1.85kw of electricity and delivering 8.6kw of heat to the home. In this scenario you would be getting 4.65 times more heat than what you are paying for in pure electricity costs. This gives the system a coefficient of performance (COP) of 4 or more, as opposed to a COP of 1 for a conventional electric fire where all heat is produced from input electrical energy. Coupled with thermostatic control and programmable timer a heat pump makes a very good investment. There is more information on heat pumps in the videos below.

Air to Air

Air source heat pumps can be split into two main categories air to water and air to air. We install both and both are fantastic at what they do. An air to air heat pump is very simply an air conditioning system if you have ever been abroad and had a hotel room with a unit in the wall that blows out cool air then you know what an air to air heat pump is. We don't have much need for cooling in Scotland so we use them in reverse i.e. instead of absorbing heat from the room inside and exuding it outside we are absorbing heat from the air outside and moving it inside. Air to air heat pumps are easy to install in an existing house with little disruption and normally no redecoration required. Panasonic heat pumps have programmable thermostats and timers and also benefit built in air purification for anyone who suffers hay fever or respiratory problems.

Air to Water

Air to water heat pumps are the same as air to air but instead of delivering the heat via air conditioning units the heat is transferred into water which is in turn circulated through your radiators and/or a hot water cylinder to provide you with domestic hot water for the shower and sink. The advantage of this is that this can provide central heating in every room in the house or heat underfloor heating. New HT heat pumps can reach up to 80c making them ideal for older radiators in existing houses. There's more information on how they work here (PDF reader available here).

More information

Why not pop in to the showroom and from the comfort of our couch, have a chat and take a look at our heat pumps, we've a working air-2-air system and an air-2-water system fitted into the heating system. Give us a ring or drop us an email (details below).

RDI Renewables are MCS accredited so you know you are in safe hands and to give you further piece of mind we’re registered with the Home Insulation and Energy Systems Quality Assured Contractors Scheme (HIES) a Trading Standards approved body.




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One of our accredited assessors will be in contact with you to discuss your requirements.
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