Heat pumps for Gore and eastern Southland

Gore and Mataura sit inland in the Mataura River valley, far enough from the coast that the sea does almost nothing to soften the winter. The frosts are harder than the city's, the fog comes up off the river and sits, and the housing is largely older town stock. It is the part of Southland where a heat pump has to work the longest hours, and where choosing on running cost rather than sticker price pays back fastest.

Inland cold and river fog

Invercargill gets some moderation from Foveaux Strait. Gore gets very little. Clear still nights in the valley drop hard, and the fog that forms over the Mataura can sit through the morning, keeping everything damp and making the house feel colder than the reading suggests.

Damp air also takes considerably more energy to warm than dry air, which is part of why houses here feel so unforgiving in June and July. A heat pump helps on both counts at once, warming the air and lowering its relative humidity so the moisture stops condensing on the coldest surface in the room.

Because the season is long, the number worth asking about is the output and efficiency at low temperature rather than the headline rating. Across a Gore winter that difference shows up on the power bill far more visibly than it would further north.

Older town housing that leans on its heating

Gore has a good stock of early twentieth century housing, and Mataura's is mostly post-war and built for freezing works families. Both share the same features: single glazing, walls that were never insulated, and rooms that were designed around a coal range or an open fire rather than any idea of whole-house warmth.

These houses lose heat steadily through the evening rather than in a rush, so what suits them is a unit that holds a low continuous output rather than one that boosts hard and shuts off. Set around 19 or 20 and left running through the cold months, that costs less than most people expect and the house never gets properly cold in the first place.

If the ceiling insulation is thin or absent, doing it first genuinely changes the size of unit needed and can bring the install price down. Worth raising at the quote either way.

Replacing a fire, and what changes with it

Plenty of homes here have heated with solid fuel for generations, and swapping to a heat pump is not a like-for-like change. A fire throws a great deal of heat into one room and lets the rest of the house look after itself. A heat pump is better at holding a steady temperature across more of the house than at rescuing a cold one quickly.

So the habit changes with the appliance: leave it running at a moderate setting rather than firing it up when you get home. Run that way it is cheaper than people expect, and the bedrooms stop being the cold part of the house.

It also dries as it warms, gently, which suits damp older housing better than a fire's fierce dry heat in one room while the rest of the place grows mould. Many households here keep the fire for the coldest fortnight and use the heat pump for the rest of a season that runs from April to October.

Sixty-five kilometres out, so it gets planned

Gore is an hour from Invercargill, so the job is set up to happen in one visit. Room sizes, ceiling heights, roof access, the switchboard and where the outdoor unit will sit are all settled at the quote rather than on the day.

Photos with your enquiry cover most of it. The heat pump installation page covers how the day runs, the installation cost page has real ranges by unit size, and an annual service matters here because the defrost cycle works a unit harder through a long frosty season.

Towns covered

• Gore
• Mataura

Elsewhere in Southland? Your local installer also covers Invercargill city, Otatara, Bluff and the coast and Winton and central Southland. The full list is on the areas we serve page, or get a free quote for your place.