कोठालाई कति क्षमताको AC चाहिन्छ, चलाउँदा कति खर्च हुन्छ?What size AC might your room need, and what will it cost to run?
कोठाको नापबाट सुरुको reference हेर्नुहोस्। अनि रोजेको AC र आफ्नो प्रयोगबाट बिजुली खर्च निकाल्नुहोस्। यो नेपालका सबै कोठालाई मिल्ने sizing rule होइन।Check a starting room-size reference, then calculate energy cost for the AC you choose. This is not a sizing rule for every room in Nepal.
दुई छुट्टाछुट्टै हिसाबTwo separate calculations
Cooling reference, final sizing होइनCooling reference, not final sizing10,200–12,200 Btu/h0.85–1.02 ton
घाम थाहा नभए छायाँदेखि धेरै घामसम्मको scenario हो। यो वास्तविक load को minimum र maximum होइन।Unknown sun shows shaded-to-sunny scenarios, not a minimum/maximum bound on actual cooling load.
कोठाको क्षेत्रफलRoom area
400 ft² / 37.16 m²
छानेको AC को coolingChosen AC cooling
3.517 kW
Rated electrical inputRated electrical input
1,005 W
औसत electrical inputAverage electrical input
703 W
दिनको ऊर्जाDaily energy
5.63 kWh
यो महिनाको ऊर्जाThis month's energy
168.8 kWh
राखिएको दरमा energy खर्चEnergy cost at your entered rateRs 1,6888 h/day × 30 days
किन्ने वा जडान गर्ने सिफारिस होइनHonesty note: not purchase or installation advice
तराईको गर्मी र चिस्यान, माथिल्लो छाना, ठूलो झ्याल, insulation, खुला ढोका, altitude र thermostat ले load र input बदल्छन्। Chart नेपालमा प्रमाणित heat-load model होइन। HVAC प्राविधिकबाट site load र उपयुक्त AC जाँच गराउनुहोस्। खर्चमा fixed bill charge, maintenance र standby ऊर्जा छैन।Terai heat and humidity, an exposed roof, large windows, insulation, open doors, altitude, and thermostat settings change load and input. The chart is not a Nepal-validated heat-load model. Have an HVAC professional check the site load and suitable equipment. Cost excludes fixed bill charges, maintenance, and energy outside the entered hours.
सूत्र र chart को सीमाFormulas and chart limits
floor area = room length × width; ft² = m² ÷ 0.09290304
reference Btu/h = chart capacity × sun factor + extra occupants × 600 + kitchen allowance
sun factor: shaded 0.9; normal 1; sunny 1.1; unknown spans 0.9–1.1
extra occupants = max(0, people − 2); kitchen allowance = 4,000 Btu/h if applicable
rated input W = cooling W ÷ efficiency (W/W), or Btu/h ÷ EER (Btu/Wh)
average input W = rated input W × entered average-input % ÷ 100
measured mode: average input W = measured kWh × 1,000 ÷ measurement hours
period kWh = average input W ÷ 1,000 × hours/day × days; cost = period kWh × entered Rs/kWh
घामको factor chart मा मात्र लाग्छ। Cost को % औसत electrical input को अनुमान हो, cooling load वा efficiency मा अर्को factor होइन। मापन भएको input भए % फेरि लाग्दैन।The sun factor applies only to the chart. The cost percentage is an assumed average electrical input, not a second efficiency or cooling-load correction. Measured input is not multiplied by that percentage.
पूरा ENERGY STAR reference chartFull ENERGY STAR reference chart
8 ft उचाइ, घाम र मानिसको adjustment अघि8 ft ceiling, before sun and occupant adjustments
Area (ft²)
Cooling (Btu/h)
100 ≤ area < 150
5,000
150 ≤ area < 250
6,000
250 ≤ area < 300
7,000
300 ≤ area < 350
8,000
350 ≤ area < 400
9,000
400 ≤ area < 450
10,000
450 ≤ area < 550
12,000
550 ≤ area < 700
14,000
700 ≤ area < 1,000
18,000
1,000 ≤ area < 1,200
21,000
1,200 ≤ area < 1,400
23,000
1,400 ≤ area < 1,500
24,000
1,500 ≤ area < 2,000
30,000
2,000 ≤ area ≤ 2,500
34,000
ठ्याक्कै band को सीमामा ठूलो band लिइन्छ। 2,500 ft² अन्तिम सीमा हो। Chart बाहिर वा उचाइ नमिले sizing देखाइँदैन। ठूलो AC हुँदैमा राम्रो हुँदैन। धेरै ठूलो भए चिस्यान हट्नुअघि नै कोठा चिसो हुन सक्छ।At a shared band boundary, the larger band is used. The final 2,500 ft² limit is included. No sizing is extrapolated outside the chart or for another ceiling height. Bigger is not always better: an oversized AC can cool the room before removing enough humidity.
दुई नमुना हिसाबTwo worked examples
यी बजार specification वा सही AC छानिएको दाबी होइनन्। नाप, efficiency, प्रयोग र दर सबै नमुना हुन्।These are illustrative inputs, not market specifications or claims that the AC is correctly sized.
400 ft², चार मानिस, घाम थाहा छैन400 ft², four people, unknown sun
20 × 20 ft, करिब 8 ft उचाइ, भान्सा होइन। Base 10,000 Btu/h।20 × 20 ft, about 8 ft ceiling, not a kitchen. Base is 10,000 Btu/h.
300 ft² को घाम पर्ने भान्सा, तीन मानिस300 ft² sunny kitchen, three people
15 × 20 ft, करिब 8 ft उचाइ। Base 8,000 Btu/h।15 × 20 ft, about 8 ft ceiling. Base is 8,000 Btu/h.
8,000 × 1.1 + 600 + 4,000 = 13,400 Btu/h
खर्चको छुट्टै नमुना: 9,000 Btu/h AC र 12 Btu/Wh EER। यो chart reference भन्दा सानो छ, यसलाई पर्याप्त AC भनेको होइन।Separate cost scenario: 9,000 Btu/h AC and EER 12 Btu/Wh. It is below the chart reference, not a claim of adequate cooling.
US EPA ENERGY STAR, Room Air Conditioners, checked 12 Sep 2026. Source of the 8 ft ceiling chart, shade/sun factors, extra-occupant and kitchen adjustments. Its consumer room-AC reference is not a local heat-load design for split systems in Nepal.
NIST Guide to the SI, Appendix B.9, checked 12 Sep 2026. Gives square-foot, Btu/h, refrigeration-ton, and kWh conversions. Here 1 Btu/h = 0.2930711 W and 1 ton = 12,000 Btu/h.
Nepal AEPC, Standards and Labeling, checked 12 Sep 2026. Lists air conditioners in Nepal's efficiency-label work. Use your equipment's actual specifications, not an invented Nepal-wide efficiency.
Nepal Electricity Authority, Consumer Tariff Rates, checked 12 Sep 2026. Rates depend on consumer category and use. The cost model uses your entered energy rate and does not calculate the full NEA slab bill.
Unknown sun को range chart का दुई scenario मात्र हो, statistical confidence interval होइन। घरको cooling load वा compressor cycle मौसमबाट निकालिएको छैन। लामो समयको मापन छ भने measured mode लिनुहोस्।The unknown-sun range compares two chart scenarios, not a statistical confidence interval. No cooling load or compressor cycle is predicted from local weather. Prefer measured mode when representative energy measurements are available.
