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2. Elevate your gardening game with a greenhouses from ... - AOL

   www.aol.com/lifestyle/elevate-your-gardening...

   This No. 1 bestselling mini greenhouse offers four roomy shelves and comes on wheels so you can easily move it from place to place. A roll-down door gives you quick and easy access. $43 at Amazon

3. Greenhouse - Wikipedia

   en.wikipedia.org/wiki/Greenhouse

   With traditional plastic greenhouse coverings having an R-value of around 2, a great amount of money is therefore spent to continually replace the heat lost. Most greenhouses, when supplemental heat is needed use natural gas or electric furnaces. Passive heating methods exist which seek heat using low energy input.

4. Air source heat pump - Wikipedia

   en.wikipedia.org/wiki/Air_source_heat_pump

   The indoor air or heating water is pumped across the heat exchanger by an electric pump or fan. The cool liquid refrigerant then re-enters the outdoor heat exchanger coils to begin a new cycle. Each cycle usually takes a few minutes. [11] Most heat pumps can also operate in a cooling mode where the cold refrigerant is moved through the indoor ...

5. Controlled-environment agriculture - Wikipedia

   en.wikipedia.org/wiki/Controlled-environment...

   Controlled-environment agriculture (CEA) -- which includes indoor agriculture (IA) and vertical farming—is a technology-based approach toward food production. The aim of CEA is to provide protection from the outdoor elements and maintain optimal growing conditions throughout the development of the crop.

6. Polytunnel - Wikipedia

   en.wikipedia.org/wiki/Polytunnel

   Air warmed by the heat from hot interior surfaces is retained in the building by the roof and wall. Temperature, humidity and ventilation can be controlled by equipment fixed in the polytunnel or by manual opening and closing of vents. Polytunnels are mainly used in temperate regions in similar ways to glass greenhouses and row covers.

7. Electric heating - Wikipedia

   en.wikipedia.org/wiki/Electric_heating

   Electric heating is a process in which electrical energy is converted directly to heat energy. Common applications include space heating, cooking, water heating and industrial processes. An electric heater is an electrical device that converts an electric current into heat. [1]