In the
lean-to, in order to get the sufficient bench and walk space inside,
it is necessary to carry the roof to a point much higher than in the
even span. The extra framework and material for the roof cost a good
deal, yet add practically nothing to the efficiency of the house."
"Heating of greenhouses is best done by hot water, and in a small
house the pipes may well be connected with the heating system used
for the dwelling, if the greenhouse and the home are within any sort
of reasonable distance from each other. For large houses, or ranges
of several houses together, the independent heating plant is
necessary. Steam is used for heating by commercial florists, but it
is economical only on a large scale."
"As a uniform temperature must be maintained in the house, the
fires, where steam is used, need watching continuously during cold
weather, for the moment the water ceases to boil, the pipes cool off
and a considerable time is consumed in starting the heat running
again. With hot water there is much more latitude in attention, for
though the fires dwindle' the water which fills the pipes will carry
heat for a long time, and it will circulate until the last degree is
radiated.
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