Perimeter heating is a heating strategy that places heat sources along exterior walls and window areas of buildings where heat loss is greatest. This approach counters infiltration and radiant cooling from outdoor-facing surfaces, maintaining comfort in occupied zones while potentially reducing overall system capacity requirements. Common perimeter heating methods include baseboard convectors, fin tube radiators, and radiant panels.
Technical Details
Perimeter heating systems typically operate with hot water temperatures of 120°F to 180°F or low-pressure steam. Design standards recommend 50 to 100 BTU/hour per linear foot of exterior wall for temperate climates, adjusting upward to 150 BTU/hour per linear foot in cold climates below 0°F. Zone control thermostats maintain setpoints between 65°F and 75°F.
Applications and Design Strategy
Perimeter heating suits office buildings, apartments, schools, and commercial spaces where window walls dominate the envelope. Systems integrate with central ventilation, allowing reduced overhead ductwork and improved individual space control. Installation along exterior walls maximizes efficiency by treating heat loss at its source.
Practical Significance
Perimeter heating improves occupant comfort near cold surfaces and reduces downdraft complaints. This strategy can reduce energy consumption by 10 to 20 percent compared to uniform interior heating, while providing flexible zoning capabilities for diverse tenant needs.