Why Choose Aircon for Heating
How heat-pump air conditioning cuts your winter energy costs compared to central heating — and why more workshops, warehouses and offices are switching.
An informative guide from the Howcroft Group technical team · Rotherham, UK
The heating bill you don't have to pay
Read time: 4 minutes
When the temperature drops, the reflex is to crank up the central heating or drag out an electric fan heater. But if you are heating a workshop, warehouse, office or shop floor, there is a far more efficient option hiding in plain sight: a portable air conditioner with a heat-pump heating mode.
The same 4-in-1 unit that keeps your team cool in summer can warm your space through autumn and winter — and it does it using a fraction of the energy. This guide explains how, why it beats traditional central heating for most commercial spaces, and what you could save.
How heat-pump air conditioning actually heats
The key word is heat pump. Instead of burning fuel or passing current through a resistive element, a heat pump moves heat.
It harvests heat from outside
Even in cold weather, there is thermal energy in the outside air. The pump captures it using refrigerant.
It compresses and concentrates it
Compressing the refrigerant raises its temperature — the same way a bicycle pump gets warm.
It delivers warm air inside
The hot refrigerant releases heat into your space, then cycles back out to repeat the process.
The result: for every 1 kWh of electricity you put in, you get roughly 3 kWh of heat out. That ratio is the Coefficient of Performance (COP). A COP of 3 means heat-pump aircon is around three times more efficient than a traditional electric heater, which can only ever give you 1 kWh of heat per 1 kWh of electricity.
Aircon vs central heating: the efficiency gap
Side-by-side, where the energy — and the money — actually goes
| Feature | Heat-Pump Aircon | Gas Central Heating |
|---|---|---|
| Heat source | Moves heat from outside air (heat pump) | Burns gas / runs boiler |
| Efficiency (COP) | ≈ 3.0 (3 units heat per 1 unit electric) | ≈ 0.9 (boiler losses + pipework) |
| Running cost per kWh of heat | Lowest of the electric options | Rising gas + standing charge |
| Warm-up speed | Minutes — directional warm air | Slow — radiators lag behind |
| Zonal control | Heat only the zone you use | Whole system on or off |
| Install / disruption | Plug-and-play, no plumber | Boiler, pipework, annual service |
| Summer use | Cools & dehumidifies too | Idle all summer |
| Best for | Workshops, warehouses, zonal heat | Whole-home continuous heating |
*Figures are typical for modern portable heat-pump units versus a conventional gas boiler system. Actual savings depend on space size, insulation, tariff and usage pattern.
A worked example: warming a 60 m² workshop bay
Say you need around 3 kWh of heat per hour to hold a comfortable 19°C in one bay over an 8-hour shift.
24 kWh
of electricity used per shift (1:1 efficiency)
~8 kWh
of electricity used per shift — a third as much
That is roughly two-thirds less electricity per shift — and because you are only heating the bay you are working in rather than the whole building, the real-world saving versus running full central heating all day is often even larger.
Why it makes sense for your space
The practical benefits that add up over a winter season
Up to 3× More Efficient
Heat pumps move heat rather than generate it, delivering around 3 units of heat for every 1 unit of electricity (COP ≈ 3). A traditional electric heater only gives 1:1.
Lower Winter Bills
Because of that efficiency, warming a workspace with heat-pump AC typically costs a fraction of running equivalent electric heaters — and routinely undercuts gas central heating for the area you actually use.
Zonal, On-Demand Heat
Only heat the bay, office or zone you are working in. No need to fire up the whole central heating system to take the chill off one corner of the building.
Instant, No Warm-Up Lag
Directional warm air brings a cold workshop up to temperature in minutes at shift start — no waiting for radiators to slowly catch up.
Lower Carbon Footprint
Using a third of the electricity of resistive heaters means a third of the emissions per unit of heat — a quick win for sustainability targets.
One Unit, Year-Round
The same 4-in-1 unit cools in summer, heats in winter, dehumidifies and fans. One capital purchase covers every season — far better value than a heater that sits idle for eight months.
When aircon heating makes the most sense
- Workshops, warehouses and factory floors where only certain zones need warmth
- Offices and retail units wanting to avoid boiler standing charges over winter
- Cold-snap top-up heating at shift start, without firing the whole central system
- Spaces that need cooling in summer too — one unit, two seasons
- Tenanted or temporary sites where installing permanent heating isn't viable
Talk to our team about a heat-pump heating solution
We will specify the right 4-in-1 unit for your space, load and budget — and show you the running-cost maths for your building. Same-day dispatch from our Rotherham warehouse.
Quick savings estimate
