The feds challenged heat pump makers to build models that worked well in the cold. The first ones are about to go on sale.

"It's kind of like supercharging your car engine," he said. A variable-speed compressor allows the heat pump to cycle that refrigerant through more quickly when the temperature is colder.

We have a variable speed compressor, and we have a mixing valve on the unit. The variable speed compressor allows us to change the speed at which we heat the water with the heat pump. By slowing that ...

heat pumps typically relied on single-speed compressors that functioned like an on/off switch, making it harder for the system to cope with extreme swings in temperature. MODERN ERA: Today’s more ...

A new solar-powered variable speed drive (VSD) model compatible with a wide range of water pumps has recently been launched. The Altivar solar ATV320 is Schneider Electric’s replacement offer ...

Its single- and two-speed pumps are more affordable initially than the variable or specialty pumps, but variable pumps might be more cost-efficient to run throughout the year. All Jandy variable ...

At only 120 lbs, the new V2 is the lightest twin-cylinder in Ducati’s history, featuring variable valve timing and ...

Whether you’re buying a home for the first time or anticipating a renewal in the near future, you’ll be faced with the same question: variable-rate or fixed-rate mortgage? And it’s a big ...

Commissions do not affect our editors' opinions or evaluations. A variable annuity is a way to get the stability of a traditional annuity product with the gains of an investment account—for a price.