Many persons who have large houses of stone or brick, now adopt the plan of heating them with hot air, which is conveyed by means of pipes into the rooms. An ornamented, circular grating admits the heated air, by opening or shutting the grates. The furnace is in the cellar, and is made large enough to allow of a considerable quantity of wood being put in at once.
A house thus heated is kept at summer heat in the coldest weather; and can be made cooler by shutting the grates in any room.
The temperature of houses heated thus is very pleasant, and certainly does not seem so unhealthy as those warmed by metal stoves, besides there being far less risk from fire.
Catherine Parr Traill, The Canadian Settler's Guide (1855), page 20, NCL edition.