Cassette AC Power Consumption (2026)Electricity Cost for Commercial Cooling — Office, Showroom & Restaurant

A 1.5-ton inverter cassette AC consumes approximately 1.5 units per hour, a 2-ton consumes 1.9 units per hour, a 3-ton consumes 2.8 units per hour, and a 4-ton consumes 3.7 units per hour. These figures assume the AC is running at typical load in a well-insulated commercial space. Non-inverter models consume 30–40% more: a 2-ton non-inverter cassette uses approximately 2.7 units per hour. Actual consumption varies by ambient temperature, room insulation, ceiling height, and set temperature. At 24°C with auto fan mode, inverter cassette ACs typically operate at 60–80% of rated capacity once the room reaches the target temperature.

No — cassette ACs do not inherently consume more electricity than split ACs of the same tonnage. A 2-ton inverter cassette AC and a 2-ton inverter split AC both draw approximately 1.8–2.2 kW at full load. The apparent difference in electricity bills comes from the spaces they serve: cassette ACs typically cool 300–500 sq ft commercial spaces for 10–12 hours daily, while split ACs cool 150–250 sq ft residential rooms for 6–8 hours. When normalised for the same space size and usage hours, the electricity consumption is nearly identical. In fact, cassette ACs can be more efficient in large open-plan offices because a single unit provides 360° airflow, eliminating the need for multiple split units with overlapping coverage zones.

Yes — an inverter cassette AC is absolutely worth buying for commercial spaces that run 6+ hours daily. Inverter cassette ACs save 30–40% electricity compared to non-inverter models by adjusting compressor speed instead of cycling on/off at full power. For a 2-ton cassette running 10 hours daily in an office, the inverter model saves approximately 180 units per month — worth ₹1,440 at ₹8/unit. Over a 10-year lifespan, that is ₹1,72,800 in electricity savings. The inverter premium for cassette ACs is typically ₹8,000–15,000 over non-inverter models, so the payback period is 6–10 months. For spaces running under 4 hours daily, the savings are less compelling and a non-inverter may be acceptable.

Mitsubishi cassette ACs save the most electricity thanks to their hyper-heating inverter technology and the highest ISE (Indian Seasonal Efficiency) ratings in the category. The Mitsubishi SLZ-M25FA 2-ton cassette achieves an ISE of 3.62, outperforming Daikin (3.52), Samsung (3.45), and LG (3.48). Voltas lags at 3.21, consuming approximately 15% more electricity than Mitsubishi for the same cooling output. However, the price gap between Mitsubishi and Daikin/LG is significant — for most commercial buyers, Daikin and LG offer the best balance of electricity savings and upfront cost. A Daikin 2-ton inverter cassette at ISE 3.52 saves roughly ₹200/month versus a Voltas at ISE 3.21, adding up to ₹24,000 over 10 years.

Cassette AC running costs for offices are moderate and justified by the cooling quality and space coverage. A 2-ton inverter cassette AC cooling a 350 sq ft office for 10 hours daily costs approximately ₹3,952/month at India's average electricity rate of ₹8/unit. A 1.5-ton inverter cassette for a 200 sq ft office costs approximately ₹3,120/month. These costs compare favourably to running multiple split ACs in the same space — two 1-ton split units would cost approximately ₹3,600/month and create uneven cooling with wall clutter. The key to controlling office AC costs is choosing the right tonnage, maintaining the unit quarterly, and setting the thermostat to 24–25°C. Offices with false ceiling insulation and double-glazed windows can reduce bills by 15–20%.

To reduce your cassette AC electricity bill: (1) Set temperature to 24–25°C with auto fan mode — each degree below 24°C increases consumption by 6–8%. (2) Ensure false ceiling insulation is intact — poor insulation adds 15–20% to cooling load. (3) Clean cassette filters every 2 weeks in dusty environments — clogged filters reduce airflow and force the compressor to work harder. (4) Use programmable timers so the AC runs only during occupancy hours. (5) Install occupancy sensors for large open-plan offices. (6) Seal gaps around windows and doors to prevent cool air escape. (7) Schedule professional coil cleaning every 6 months. (8) Use the dry mode during monsoon instead of cool mode — it removes humidity with 30–40% less power. Combined, these measures can cut your cassette AC bill by 25–35%.

A 3-ton inverter cassette AC running 10 hours daily costs approximately ₹5,824 per month at India's average ₹8/unit rate. At 12 hours daily (typical for restaurants and clinics), the bill rises to ₹8,064/month. In Mumbai with commercial rates of ₹13/unit, the same 10-hour usage costs ₹10,920/month. The 3-ton cassette is designed for 320–450 sq ft spaces — using it in a smaller room causes short-cycling and actually increases per-hour consumption. For accurate estimates, use our AC Power Consumption Calculator with your specific city, tonnage, and daily usage hours.

Yes — commercial electricity tariffs significantly affect cassette AC running costs. In India, commercial rates are typically 15–30% higher than domestic rates. For example, Delhi domestic consumers pay approximately ₹7.5/unit while commercial consumers pay ₹9.5/unit. Mumbai has the steepest gap: domestic ₹10.5/unit versus commercial ₹13/unit. A 2-ton cassette AC running 10 hours daily costs ₹4,560/month at domestic rates but ₹5,850/month at Mumbai commercial rates — a ₹1,290 monthly difference. Some states offer separate MSME (Micro, Small and Medium Enterprises) tariffs that are 10–15% lower than standard commercial rates. If your office qualifies as an MSME, applying for this category can reduce your AC electricity bill noticeably.