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COOLING LOAD GUIDE-SQUARE FEET METHOD
ROOM AIR CONDITIONERS
To make sure you
choose
the right size unit, use thts “COOLING LOAD GUIDE -
SQUARE FEET
METHOD.”
It is a qurck, easy means of computing capacity.
for eItremR III exposure. shadmg. rnsulat~on and bulldmg conslruchon.
AHAM Coolrng Load Eslrmale Form RAG1 musl be used
COOLING CAPACITY REQUIRED--BTU/HR
INSTRUCTIONS:
1.
Determine Ihe area to be cooled In square feel and locate that
pomt on the lefl side of chart
2. Move horizonlally across to the center line 01 Band A, E or C
according lo the condition of the ceiling in Ihe area to be cooled.
&ml A-Occupied Space Above Ceiling
band B-Insulated Ceiling Under Attic
Band C-Non-Insulated Ceiling Under Attic
3. From center of band move within the band to leh for more
northerly exposure or right for more westerly exposure.
4. From this point, read down to bottom of charl to determlne
required Btulhr oulpul. Write the Btulhr figure in the space
indicated below.
5.-
Btu/hr (from number 4 above).
6.- Locate your geographic area on Inset map and mulhply
faclor shown by hqure m number 5.
7..---If room air conditioner IS Intended prrmarlly for nlghl-
time coohna. subtract 30% lfrom fiaure In number 6)
6.__- Subtract 3d Btuihr from figure ln<number 7 (or 6) for
each hear foot of wall separatmg the area lo be cooled
from another cooled room
6.__
If more lhan Iwo people occupy area, add 600 t3tuihr per
person (to II
i
ure VI number 8); if only one person.
subtracl 600 tu/hr.
lo.-
Add 4000 Btulhr (to figure m number 9) If area lo be
cooled Includes kitchen.
For best results. a room conditionmg unll or units wllh a cooling
capacity rafmg close ?o that estimated above should be selected.
A smaller capacity unit operating continuously ~111 contrrbute
more to comfort than a larger capacity unit operatmg Intermit-
tently.
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