How to choose home heating in Taiwan? Air conditioner vs electric heater vs fan heater actual comparison

Although Taiwan is located in the subtropics, from December to February every year, temperatures below 10°C are common in areas such as Taipei, Keelung, and New Taipei. Coupled with high humidity, the temperature feels even colder than some cities in Japan. However, Taiwanese households generally lack central heating systems, and most people rely on "reverse air conditioning" or mobile electric heaters for heating. Which method is more effective, energy-saving and safe? When the outdoor temperature of the variable frequency air conditioner is higher than 7°C, the greenhouse efficiency (COP value) can reach more than 3.0, which means that 1 degree of electricity consumption can produce 3 degrees of heat energy, which is far better than an electric heater. But when the outdoor temperature falls below 5°C, the compressor efficiency drops sharply and even automatically shuts down for protection. According to official data from Taiwan's Daikin and Hitachi, most domestic air conditioners are almost unable to provide effective heating below 5°C. In addition, the air conditioning and heating will make the indoor air drier, and the hot air will be concentrated on the ceiling, leaving your feet feeling cold. It is recommended to use a circulation fan to promote convection and set it to 22–24°C. Every 1°C increase will increase power consumption by about 6%. Oil-type electric heaters dissipate heat through thermal oil, and the surface temperature is only 50–80°C. They are suitable for families with young children or pets. The advantage is that it continues to dissipate heat for 1-2 hours after shutting down, making it suitable for long-term use. The disadvantages are slow heating (it takes about 30 minutes to reach a comfortable temperature), large size, and the power is mostly 1500W. It consumes about 12 kWh of electricity for 8 hours of continuous use, and the electricity cost is high. Suitable for small spaces such as bathrooms or study rooms, it can blow out hot air within 30 seconds. But it is a "convection" heating, it will get cold when it is turned off, and it will make a lot of noise. When purchasing, be sure to choose one with dual safety devices of "automatic power-off when dumped" and "overheating protection" to avoid igniting nearby items. A study by the Department of Architecture of the National Taiwan University of Science and Technology pointed out that in an environment with a humidity of 80%, even if the room temperature is 18°C, the body temperature is only about 13°C. Therefore, "dehumidification" is more important than simple heating. It is recommended to use a dehumidifier during the day to control the humidity below 60%, combined with local heating, to improve comfort and reduce energy consumption. In addition, if there are elderly people or patients with cardiovascular disease at home, they should avoid using infrared quartz tube heaters - the surface temperature of such products can reach over 300°C, and there is no oxygen consumption warning. There have been many cases of carbon monoxide poisoning (source: Ministry of Health and Welfare 2024 Home Accident Statistics). No matter what kind of heating equipment is used, do not cover clothes for drying, and keep 50 centimeters away from flammable objects. According to Taipower data, peak electricity consumption in winter often causes power outages due to intensive use of heating equipment. It is recommended to stagger the use of heating equipment with high-consumption appliances such as electric cookers and kettles. Summary: If your residence is often below 10°C in winter and your budget allows, you may consider installing a "cooling and heating variable frequency separate air conditioner"; if it is only used occasionally, oil-type electric heaters are safer; for bathrooms, heaters with an IPX4 waterproof rating or above are recommended. Most importantly, don’t forget to seal window gaps and install thick curtains to fundamentally reduce heat loss. The information in this article is synthesized from: Taiwan Electric Power Company's "Winter Electricity Safety Guidelines", the Ministry of Economic Affairs' Bureau of Standards and Inspection Electric Heater Safety Specifications (CNS 60335-2-30), Taiwan Daikin's official website technical white paper, and the "Taiwan Residential Thermal Comfort Survey Report" published by the Building and Climate Research Laboratory of National Cheng Kung University in 2025.

New knowledge on air conditioning power consumption and Taiwan climate maintenance regulations in recent years (2025-2026 current situation)

With the high temperatures in summer breaking historical records and the adjustment of electricity price structure in recent years, the latest statistics from the Energy Administration of the Ministry of Economic Affairs show that air-conditioning equipment accounts for more than 47% of residential electricity consumption in summer. Many people mistakenly believe that if the air conditioner is not cold, they only need to "replenish the refrigerant." However, in fact, refrigerant is not naturally consumed during normal operation in a closed circuit. If the refrigerant is insufficient, it means that there are micro leaks in the copper pipes or joints. Simply replenishing the air conditioner will only treat the symptoms but not the root cause. Refrigerant leakage will aggravate the high temperature overload of the compressor and shorten its service life.

According to Taiwan's standard operating specifications for air-conditioning projects, it is recommended that professional technicians with a refrigeration and air-conditioning decoration technician license perform "full machine high-pressure water washing and evaporator deep sterilization" every 1 to 2 years for detached air-conditioning indoor units. Especially in the humid summer in the Shuangbei Basin, the air drum and water collection tray are easy to breed black mold and jelly-like biofilm. This is also the main reason for the sour smell in the air-conditioning outlet and the backflow of the drainage pipe. Regular maintenance can maintain CSPF (Air Conditioning Seasonal Performance Factor) level one energy efficiency level, which can save an average household 15% to 20% of air conditioning electricity bills every year.

Autonomous simple maintenance vs professional maintenance safety red line

• Homeowners can do by themselves: Remove and clean the nylon filter regularly every 2 to 3 weeks (rinse with clean water and dry in a cool place, do not expose it to the sun to avoid deformation and embrittlement); clean the air outlet blades of the indoor unit with a dry cloth; check whether there is any accumulation of debris within 50 cm around the outdoor unit that hinders heat dissipation.
• Professional technicians must be entrusted according to regulations: Refrigerant pressure testing and leakage repair welding, high-pressure cleaning of indoor unit air drums and aluminum fins with liquid chemicals, reset of the drainage slope of hidden cold water pipes in the ceiling, and 220V dedicated power circuit configuration and leakage circuit breaker replacement.