An air conditioner unit includes a refrigeration loop, a variable speed compressor coupled to the refrigeration loop, an indoor temperature sensor, an electric heater, and a controller operably coupled to the variable speed compressor, the indoor temperature sensor, and the electric heater. The controller is configured to operate the variable speed compressor at a target speed, identify an auxiliary heating trigger of the air conditioner unit, and operate the electric heater according to the auxiliary heating trigger.

An air conditioner unit includes a refrigeration loop, a variable speed compressor coupled to the refrigeration loop, an indoor temperature sensor, an electric heater, and a controller operably coupled to the variable speed compressor, the indoor temperature sensor, and the electric heater. The controller is configured to operate the variable speed compressor at a target speed, identify an auxiliary heating trigger of the air conditioner unit, and operate the electric heater according to the auxiliary heating trigger.

A bathroom air-conditioner includes a refrigerant circuit in which a compressor, a radiator, a decompressing mechanism and a heat absorber are connected with one another through a pipe, a circulating air-course, and a ventilating air-course. In the circulating air-course, the radiator and a circulating fan for circulating the air of the bathroom are placed. In the ventilating air-course, the heat absorber and a ventilating fan for discharging the air from the bathroom to the outside are placed. The heat absorber makes the refrigerant absorb heat from the air of the bathroom, and the radiator makes the refrigerant dissipate heat to the air of the bathroom for heating the bathroom. During the heating of the bathroom, when a temperature of the bathroom becomes higher than a given temperature, a controller reduces an air-blow amount from the ventilating fan.

A bathroom air-conditioner includes a refrigerant circuit in which a compressor, a radiator, a decompressing mechanism and a heat absorber are connected with one another through a pipe, a circulating air-course, and a ventilating air-course. In the circulating air-course, the radiator and a circulating fan for circulating the air of the bathroom are placed. In the ventilating air-course, the heat absorber and a ventilating fan for discharging the air from the bathroom to the outside are placed. The heat absorber makes the refrigerant absorb heat from the air of the bathroom, and the radiator makes the refrigerant dissipate heat to the air of the bathroom for heating the bathroom. During the heating of the bathroom, when a temperature of the bathroom becomes higher than a given temperature, a controller reduces an air-blow amount from the ventilating fan.

Embodiments of the invention provide a pool heater including a housing, a first tankless heater, a second tankless heater, and a controller. The controller is configured to activate only the first tankless heater when a first condition is met, activate only the second tankless heater when a second condition is met, and activate the first and the second tankless heaters simultaneously when a third condition is met.

Embodiments of the invention provide a pool heater including a housing, a first tankless heater, a second tankless heater, and a controller. The controller is configured to activate only the first tankless heater when a first condition is met, activate only the second tankless heater when a second condition is met, and activate the first and the second tankless heaters simultaneously when a third condition is met.

An integrated ventilation unit configured to provide ventilation and conditioned air to an indoor space may include a heat pump system, an energy recovery device and a control unit. The heat pump system may include a first coil located at a supply air side of the ventilation unit, a second coil located at an exhaust air side of the ventilation unit, and a compressor. The energy recovery device may be configured to transfer heat between a return air stream and a supply air stream and the control unit may be configured to control operation of the heat pump system and the energy recovery device.

An integrated ventilation unit configured to provide ventilation and conditioned air to an indoor space may include a heat pump system, an energy recovery device and a control unit. The heat pump system may include a first coil located at a supply air side of the ventilation unit, a second coil located at an exhaust air side of the ventilation unit, and a compressor. The energy recovery device may be configured to transfer heat between a return air stream and a supply air stream and the control unit may be configured to control operation of the heat pump system and the energy recovery device.

A looped, pump assisted heat pipe system is provided including an underground well bore providing a vertical distance between an evaporator and a condenser of the system. The system includes a fluid loop with a circulating fluid, an evaporator arranged in the fluid loop configured to evaporate circulating fluid in a liquid state to a vapor and a condenser arranged in the fluid loop in the underground well bore configured to condense the vapor into the liquid state. A pump can be arranged at the base of the well bore, in the fluid loop between the condenser and the evaporator configured to pump circulating fluid in the liquid state to the evaporator. The system can be used in heating or cooling air for buildings and structures and water sources.

A looped, pump assisted heat pipe system is provided including an underground well bore providing a vertical distance between an evaporator and a condenser of the system. The system includes a fluid loop with a circulating fluid, an evaporator arranged in the fluid loop configured to evaporate circulating fluid in a liquid state to a vapor and a condenser arranged in the fluid loop in the underground well bore configured to condense the vapor into the liquid state. A pump can be arranged at the base of the well bore, in the fluid loop between the condenser and the evaporator configured to pump circulating fluid in the liquid state to the evaporator. The system can be used in heating or cooling air for buildings and structures and water sources.