Indoor Design Temperatures

Reference data and engineering information about indoor design temperatures for hvac systems applications.

indoordesigntemperatures

Overview

Engineering reference data for Indoor Design Temperatures in HVAC systems.

Key Formulas

Sensible Heat

$Q = \dot{m} c_p \Delta T$

Heat causing temperature change.

Latent Heat

$Q = \dot{m} h_{fg} \Delta\omega$

Heat causing moisture change.

COP (Cooling)

$COP = Q_c / W$

Coefficient of performance.

Variables

Symbol	Description	Unit
$Q$	Heat transfer	W
$\dot{m}$	Mass flow rate	kg/s
$c_p$	Specific heat of air	J/(kg·K)
$\Delta T$	Temperature difference	K

Winter Indoor Design Temperatures

Acceptable indoor temperatures for winter conditions vary by room type and activity level.

34 rows

Indoor design temperatures for heated rooms in winter conditions.
Room Type	Temperature(°F)	Temperature(°C)
Bars	64	18
Bathrooms	72	22
Bedrooms	64	18
Changing rooms	72	22
Churches	64	18
Cloakrooms	61	16
Classrooms	68	20
Corridors	61	16
Dining rooms	68	20
Dressing rooms	70	21
Exhibition halls	64	18
Factories (sedentary work)	64	18
Factories (light work)	61	16
Factories (heavy work)	55	13
Gyms	59	15
Halls (assembly)	64	18
Halls (entrance)	61	16
Hotel rooms	70	21
Laboratories	68	20
Lecture rooms	68	20
Libraries	68	20
Living rooms	70	21
Museums	68	20
Offices	68	20
Operating theaters	75	24
Prisons	64	18
Recreation rooms	64	18
Restaurants	64	18
Shops	64	18
Stores	59	15
Swimming baths	81	27
Waiting rooms	64	18
Wards	64	18
Warehouses	61	16

Source: engineeringtoolbox.com

Summer Indoor Design Temperatures

For summer conditions, indoor environments should maintain:

Optimum temperature: 20 °C to 22 °C
Optimum relative humidity: 40% to 65%

For short exposures (less than 3 hours), acceptable indoor conditions based on outside temperatures with constant indoor dew point at 14 °C:

Interactive Charts

Indoor Comfort Temperatures vs. Outdoor Temperatures

References

Original Source

Source: engineeringtoolbox.com