The pavilion plan was designed to leak. Every ward block stood apart, wrapped in open air, its windows meant to be opened and its ceiling lifted high enough to dilute whatever rose from thirty beds below. That commitment to volume and exposure was, medically, the whole point. Architecturally, it was ruinous to heat.
The physics were unforgiving. A Nightingale ward of the standard pattern held something close to 1,500 cubic feet of air per bed — a number Florence Nightingale published in Notes on Hospitals in 1859 as a minimum, not a target. Multiplied across a pavilion of thirty beds, then across the six or eight pavilion fingers of a large teaching hospital, the volume of air that had to be warmed from cold-damp to tolerable was enormous. The connecting corridors, themselves uninsulated and often partially open to encourage air movement, shed heat in every direction. Coal consumption at the great Victorian hospitals ran to figures that alarmed their governors year after year.
John Shaw Billings, planning Johns Hopkins in Baltimore through the 1870s, was acutely aware of this tension. He designed for ventilation — open wards, high ceilings, controlled air movement — while also specifying steam heating systems that could maintain ward temperatures against the mid-Atlantic winter. The capital cost of those boiler plants was itself a charge laid against the sanitary argument.
The objection sharpened in colder climates. In Scandinavia, where the sanatorium tradition pushed patients into cold outdoor air as part of the cure, the energy accounting was even starker. What saved the pavilion's reputation in the short term was that nobody had a credible alternative: the sealed, mechanically ventilated block had not yet proved itself.
Once germ theory settled the science in the 1880s and 1890s, the miasmatic logic that justified all that air evaporated — and with it went the strongest argument against the accountants. Cross-ventilation stopped being a therapeutic instrument and became an overhead. Hospital boards, suddenly free to close windows without medical guilt, did. The deep plan and the sealed tower that followed were, in part, a fiscal argument that germ theory had finally licensed.
The pavilion did not lose to medicine alone. It lost, in the end, to the fuel bill.