Eighteen guides and tools, organised by the question you are trying to answer. Size guides give hot-climate room areas; the rest start from a specific model, and each links back to a calculator you can use with your own numbers.
Start with a specific model
Read the label and the listing
How do you read Cooling Capacity and Input Power?
Which number describes cooling and which one describes electrical input.
Read →Energy labelSaudi AC energy label: SEER, grades A–G and the December 2026 update
Read the SEER value and grade correctly and compare two units of the same capacity.
Read →Test conditionsT1 vs T3: why capacity at 46 °C matters
What the two SASO test points mean and how to use them when you check a model.
Read →Checklist12 red flags in AC listings and quotes
Spot class-only capacities, swapped kW values, missing outdoor units and borrowed labels.
Read →Room size by AC capacity
9,000 BTU (0.75 ton)
About 10 m² (112 sq ft) in average hot-climate conditions.
Read →Room size12,000 BTU (1 ton)
About 14 m² (149 sq ft) in average hot-climate conditions.
Read →Room size18,000 BTU (1.5 ton)
About 21 m² (224 sq ft) in average hot-climate conditions.
Read →Room size24,000 BTU (2 ton)
About 28 m² (299 sq ft) in average hot-climate conditions.
Read →Room size30,000 BTU (2.5 ton)
About 35 m² (373 sq ft) in average hot-climate conditions.
Read →Room size36,000 BTU (3 ton)
About 42 m² (448 sq ft) in average hot-climate conditions.
Read →Choose the right size and type
How do you test a specific 18,000 BTU model?
Why the “18k” class alone is not enough—three rooms, one model.
Read →FitToo big or too small? What a poor fit does
Short cycling, humidity and peak-day shortfall—and how our verdict bands are set.
Read →SpecificationsInverter or fixed speed?
How compressor type changes the reading of a specific model.
Read →AC typesSplit, window or portable: which specs to compare
The values that matter for each type, including matched pairs and dual ratings.
Read →Dehumidifiers
Dehumidifier size + running-cost calculator
Pints/day plus daily, monthly and yearly cost from your room and electricity rate.
Open calculator →DehumidifierDehumidifier IEF explained: estimate kWh before you buy
Turn the Integrated Energy Factor into kWh per day with a small calculator.
Read →Reference
Outside our scope
A practical path from product label to purchase decision
- Collect model specs: model number, Cooling Capacity, Input Power, annual energy use and compressor type.
- Verify the units: do not treat BTU/h as electricity use and do not rely on a marketing “18k” class without the official value.
- Run your room: open the checker, enter dimensions, city, sun, insulation and windows, then save the result URL for model-to-model comparison.
- Read the reason: PASS, BORDERLINE or FAIL starts a review of the model; it is not a performance guarantee.