Steps to Healthier Homes HOUSE AS A SYSTEM

Steps to Healthier Homes HOUSE AS A SYSTEM 1

LEARNING OBJECTIVE Page 3. 1 IDENTIFY three important housing systems that contribute to a comfortable living space. 2

WHAT’S A HOUSE? Page 3. 1 3

HOMES SHELTER US FROM: Page 3. 2 Animals and insects Wind Sun Rain (sleet, snow) Cold or hot air Dust 4

Anchorage Billings Marquette Saint Paul Bangor Cleveland Seattle Boston Salt Lake DC Denver Nashville Saint Louis San Francisco Phoenix Atlanta Los Angeles Honolulu Tulsa Houston New Orleans Wichita Miami Saint John 5

MOST OF US ARE COMFORTABLE: Page 3. 2 Air temperature: 65° F(active) – 80° F (bathing) Air relative humidity: 30% – 70% Air motion: 20 – 40 feet per minute Surrounding surface temperatures: within 10 – 15° F of room air 6

WE HAVE SYSTEMS TO: Page 3. 3 Add heat Remove heat Ventilate Maybe add or remove humidity 7

HEATING SYSTEMS § § § 3. 3 Fuel – gas, oil, wood, electric Distribution § § Page Hot water, steam, warm air, space heaters Radiators, baseboard, ducts Radiant floors and ceilings Chimneys, sealed combustion, fan powered Temperature Controls 8

Cooling coil Heat recovery ventilator Hot water heater Furnace Intake for furnace 9

Page 3. 6 Heat Exchangers 10

COOLING SYSTEMS Page 3. 6 Fuel – electric Windows, fans and shades Distribution Central air Through the wall Duct-less splits Dehumidification Air conditioners/part-load Dehumidifiers Control – thermostat, humidity 11

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INTERNAL AND SOLAR GAINS: Good when cold out; bad when hot out Page 3. 8 Heat from people Heat from appliances Solar through windows Average US house 23% of heating is done by these gains 59% of cooling is caused by these gains 14

OTHER FACTORS Water drinking, cooking, washing, toilets Cooking and storing food Ventilating fans Page 3. 8 Lighting Computers, stereos, hair dryers, razors 15

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LEARNING OBJECTIVE Page 3. 8 IDENTIFY three important housing systems that contribute to a comfortable living space. 19