CHAPTER X 



GREENHOUSE HEATING 



Generally speaking, there are only two 

 satisfactory methods of greenhouse heating: 

 Steam and hot water. Direct heating by 

 stoves is not satisfactory even in small 

 houses, and no satisfactory system has yet 

 been devised for the use of hot-air furnaces. 

 The only method aside from steam or hot 

 water which deserves mention is heating by 

 flues. They are wasteful of fuel, and their 

 use is not justified, except in cheaply con- 

 structed houses which are used only for a 

 few months in the spring or fall. 



The principles pertaining to greenhouse 

 heating are much the same as those involved 

 in heating other buildings, except that the 

 loss of heat is greater from glass than from 

 wood or brick walls, and a higher and more 

 constant night temperature is required than 

 is necessary in dwellings. For this reason, 

 relatively more radiating surface is required 

 and boilers of larger capacity are needed. 



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