Greenhouse heating devices use either gas or electricity, depending upon your specific needs. There's an important formula you should use to calculate how much BTU your heater should provide, check out a recommended web vendor for more information. There are many accessories that go with a greenhouse heater, these are especially important if you live in places with moderate weather. Thermostats are almost always a must-have, most growers need to keep their greenhouse kits at specific temperatures to see results.

The wattage of your plant lights depends heavily on the growing area. The lowest you should go is 100 watts, and that's only for an area of four square feet. The wattage needed depends greatly on the area, so it's best to consult a chart for the most accurate lighting possible.

High pressure sodium lights are designed to provide lights to plants which feel the sun. Greenhouse kits often use plant grow lights to extend the blooming season by several months. High pressure sodium lights emit wavelengths which trigger plants to flower and bud.

For the grower who works exclusively indoors, metal halide grow lights usually work best. These emit wavelengths that trigger development of leaves and compact growth. Generally, the only indoor grower who might not use metal halides is the grower who has a lot of extra space.