AC Tonnage Calculator Texas

Sizing an air conditioner in Texas? Because Texas has a hot climate, rooms need a different AC size than in a temperate region. The calculator below is pre-set to Texas’s climate — enter your room’s area for an instant tonnage. Texas summers are long and hot — Houston is hot and humid, while West Texas is hot and dry, and cooling season stretches from April into October. Rooms need meaningfully more capacity than in a mild climate. Texas has a deregulated power market, so running costs vary by your retail plan.

AC Tonnage Chart for Texas by Room Size

These are typical AC sizes for Texas’s climate, for a room with an 8-foot ceiling and average insulation. Larger, top-floor, or west-facing rooms may need the next size up:

Sizing AC for Texas’s Climate

For Texas heat, an inverter split sized one step above the mild-climate figure keeps up through the long, hot afternoons. The calculator applies Texas’s climate factor automatically; you can still fine-tune ceiling height, insulation, sun exposure, and room type above to match your exact space. Remember that an oversized AC cools quickly but short-cycles and dehumidifies poorly — matching the tonnage to the room gives better comfort and lower running costs.

Frequently Asked Questions — Texas

What size AC do I need for a bedroom in Texas? A typical 150 sq ft bedroom in Texas needs about a 0.5 Ton AC (3,757 BTU/hr). Larger rooms scale up per the chart above.

Why does Texas need a bigger AC than a mild climate? Texas’s hot climate raises the cooling load, so the same room needs more capacity than it would in a temperate region — the calculator applies that adjustment automatically.

How many BTU for a 150 sq ft room in Texas? Around 3,757 BTU/hr under standard conditions. Adjust ceiling height and sun exposure in the calculator for a precise figure.

To see where cooling capacity comes from, read the refrigeration cycle explained.