Humansdorp gets hot summer afternoons and properly cold winter nights. A reverse-cycle inverter aircon can handle both, often for less electricity than a heater. Here is how it works and what to look for.

Quick answer

Yes. A reverse-cycle inverter aircon cools in summer and heats in winter. Because it moves heat rather than making it from scratch, it typically delivers several units of heat for every unit of electricity it uses, which makes it cheaper to run than bar, fan or oil heaters. Size it for the hottest summer afternoon and it will usually heat the room comfortably too.

Humansdorp's two-season problem

Humansdorp is only a short drive inland from Jeffreys Bay, but it does not have the sea to soften the weather. Summer afternoons are hotter than at the coast, and on clear winter nights temperatures drop sharply. Many households end up with fans and an aircon for summer, and a collection of heaters for winter.

A reverse-cycle aircon replaces most of that with one appliance on the wall.

How a reverse-cycle aircon heats

In cooling mode, an aircon pulls heat out of your room and dumps it outside. In heating mode, a reverse-cycle unit simply runs the process backwards: it pulls heat out of the outside air, even when it is cold, and releases it inside. This is the same principle a heat pump geyser uses.

Because it moves existing heat instead of creating it, a good inverter unit can deliver several units of heat energy for every unit of electricity it uses. A bar heater or oil heater converts electricity to heat one-for-one. That is why reverse-cycle heating is usually much cheaper to run.

Comparing the options

Bar and fan heaters

Cheap to buy, but expensive to run. They heat the space directly in front of them and the room cools quickly when they switch off. Fan heaters can be noisy and dry the air.

Oil heaters

Gentler, more even heat, but slow to warm a room and still a one-for-one conversion of electricity to heat. They also use a lot of power over a long winter evening.

Gas heaters

Popular during power cuts. They heat quickly, but need ventilation, add moisture to the air and cost money in gas refills. Gas appliances should be installed and maintained by a registered gas installer.

Fireplaces and wood stoves

Great atmosphere and good heat, but they heat one area, need wood and cleaning, and do not help in summer.

Reverse-cycle inverter aircon

Heats and cools, is efficient to run, heats the whole room evenly and can be set on a timer to warm a bedroom before bedtime. The upfront cost is higher, but you get two appliances in one.

Sizing for both seasons

In Humansdorp, sizing is usually driven by summer cooling, because hot afternoons are the hardest test. A unit sized correctly for summer will normally heat the same room well in winter. Undersizing is the most common mistake: a small unit bought on special might just about cool the room in summer but runs flat out in winter and still feels inadequate.

Things that increase the size you need:

  • West-facing windows and afternoon sun
  • Corrugated iron or uninsulated roofs
  • High ceilings, common in older Humansdorp homes
  • Large windows or glass doors
  • Rooms that are used a lot, like the lounge or home office

As a guide, Humansdorp bedrooms often suit 12,000 BTU units, and open-plan living areas 18,000 to 24,000 BTU. A site visit confirms the right size.

Getting the best heating performance

  • Insulate the ceiling. Heat rises and escapes through an uninsulated ceiling. Insulation makes both heating and cooling far more effective.
  • Close curtains at night. Windows lose a lot of heat. Thick curtains help.
  • Use the timer. Set the unit to start heating a bedroom 30 minutes before bed instead of running it all evening.
  • Pick a sensible temperature. Around 20 to 22 degrees is comfortable for most people in winter.
  • Keep the outdoor unit clear. On frosty mornings the outdoor unit will defrost itself periodically, which is normal. Make sure water can drain away and the unit is not blocked by leaves or dust.

Running on solar and backup power

Many Humansdorp homes and farms have solar systems and inverters for load shedding. Inverter aircons suit these systems well because they start gently and draw less power once the room is at temperature. Before running an aircon on backup power, check the starting and running power against your inverter's capacity and your battery storage.

Dust and maintenance

Humansdorp's gravel roads and farmland mean more dust than at the coast. Dusty filters reduce airflow in both heating and cooling modes. Clean the filters every few weeks when the unit is used daily, and have the unit professionally serviced once a year. A service includes cleaning the coils, checking refrigerant pressures and clearing the drain.

Is it worth it?

For most Humansdorp homes that use heaters in winter and fans or an aircon in summer, a correctly sized reverse-cycle inverter unit is one of the most practical upgrades available. It is more comfortable than a heater, works year-round and usually costs less to run.

Frequently asked questions

Does a reverse-cycle aircon work on very cold Humansdorp nights?

Yes. Modern inverter units are designed to heat well in temperatures well below what Humansdorp normally experiences. Efficiency drops as it gets colder, but it remains effective.

Why does the outdoor unit stop and steam on cold mornings?

It is defrosting. In heating mode, frost can form on the outdoor coil, and the unit briefly reverses to melt it. This is normal and usually lasts a few minutes.

Is a reverse-cycle unit more expensive than a cooling-only unit?

Slightly, but most split units sold today are reverse-cycle anyway. The small difference is easily outweighed by the winter heating savings.

Apex HVAC is an independent company and is not affiliated with or authorised by any appliance manufacturer. This guide is general advice. For anything involving electricity or refrigerant gas, use a qualified technician.

Need a hand? See our aircon installation service in Humansdorp.