Rather you are making one yourself or looking to purchase, you need to know what your options are. You will find that there are many things that a cold frame is made out of, but most of the time you will run into glass. As for price, you will find that the price will vary, but they can cost quite a bit of money.
You will want to make sure that you are positive about this investment and that you also care about your investment more then just a fly-by night hobby. This is something that will take some dedication and concern. Do you have the time to care for a cold frame greenhouse? You may want to consider the rest of the article before you make a hasty decision.
Basically, you will use a cold frame so that you can keep your gardening hobby going through the off-season. You will want to make sure that you use a cold frame to help you to endorse plant growth.
You will want to put one together yourself if you have the materials and the time, but you can always purchase a cold frame or a hot bed for your seeds. You will find that the cold frame happens to be a box that has a lid (usually made from glass and is clear). This is so that it can absorb as much energy as possible. You will want to make sure that you think about the foundation for the cold frame.
When it comes to the foundation you will want to think about something that the plants can drain the water through. This way the plants do not develop root rot. You will want to make sure that you protect your plants from having too much moisture. It is very important that you give yourself the opportunity to make the most out of the hot bed.
Most of the time you will see that people will use a piece of insulation to help protect the plants from the coldness. Basically, you will use the insulation and then cover it with dirt or pots. If you would like you can always use glass or wood to make the bottom of the cold frame. Keep in mind that the materials that you use can be extra materials that you have laying around the basement or garage.
You will find that you can purchase these or build these. If you are going to build one it is best that you get your plans set and you do yourself a favor and research making a cold frame. This is because you will want to make sure that you use the best materials for your price range and also put the cold frame together nicely. This is something that an experienced gardener would want to do.