Discover why the 4-inch color screen is becoming the industry’s sweet spot. We analyze the shift to deep customization, efficient interaction, and the supply chain maturity driving this HVAC standard.

Afternoon Tea “Energy Station” event: a refreshing break to boost morale, recharge productivity, and enhance employee well-being as we accelerate toward 2025.

SASWELL launches a 4-inch HD color screen thermostat featuring 7-day fast customization and 7-platform HVAC compatibility. Get high-precision temperature control and a personalized interface.

HVAC systems are classified as either self-contained unit packages or as central systems. Unit package describes a single unit that converts a primary energy source (electricity or gas) and provides final heating and cooling to the space to be conditioned. Examples of self-contained unit packages are rooftop HVAC systems, air conditioning units for rooms, and air-to-air heat pumps.

Remember, this is for electric water heaters

The majority of modern heating/cooling/heat pump thermostats operate on low voltage (typically 24 volts AC) control circuits. The source of the 24 volt AC power is a control transformer installed as part of the heating/cooling equipment. The advantage of the low voltage control system is the ability to operate multiple electro mechanical switching devices such as relays, contactors, and sequencers using inherently safe voltage and current levels. Built into the thermostat is a provision for enhanced temperature control using anticipation. A heat anticipator generates a small amount of additional heat to the sensing element while the heating appliance is operating. This opens the heating contacts slightly early to prevent the space temperature from greatly overshooting the thermostat setting. A mechanical heat anticipator is generally adjustable and should be set to the current flowing in the heating control circuit when the system is operating. A cooling anticipator generates a small amount of additional heat to the sensing element while the cooling appliance is not operating. This causes the contacts to energize the cooling equipment slightly early, preventing the space temperature from climbing excessively. Cooling anticipators are generally non-adjustable.

In the USA, about 90% of homes are powered by a central heating/cooling system like a central furnace or a boiler or a heat pump based system. We write about boiler thermostats in this guide, which are thermostats for controlling central boiler units. A boiler is basically a specially designed water heater – which distributes heat through hot water, while systems like a central furnace distribute heat through the warm air. Water is heated in a special chamber of the boiler (which is usually powered by gas or fuel oil) and is then distributed to different rooms of the home via radiators or other heat distribution systems installed. A boiler thermostat helps in controlling the boiler operation, thus maintaining a proper set temperature inside the home.

Kuala Lumpur, Malaysia – September 12, 2025 – SASWELL showed off its range of smart HVAC controls at ENGINEER & MARVEX 2025, a big air-conditioning, refrigeration, and ventilation show in Southeast Asia. Industry people, partners, and visitors from all over seemed pretty interested.