Straight Cool 3 - 20 Ton

Outfit mid-to-large spaces with reliable Straight Cool performance in the 3 - 20 ton range. These R-32 light-commercial split and rooftop options deliver cool-only comfort with optional electric heat.

Read more
show more

Straight Cool 3 - 20 Ton

Designed for licensed contractors, property managers, and light commercial teams, this category covers cool-only rooftop and split systems ideal for offices, retail, multi-family and equipment rooms. Use them for replacements of existing straight-cool condensers and air handlers or new builds where electric heat strips provide simple supplemental heat.

Capacities span 3, 4, 5, 7.5, and 10 tons (about 36,000 to 120,000 BTU). R-32 refrigerant delivers lower environmental impact with strong efficiency potential, while SEER2 ratings vary by model to meet regional and code requirements. Choose split system air handlers matched to cool-only condensers, and add electric heat kits where needed for straightforward installation and service.

To simplify selection, shop subcategories by size: 3 - 5 Ton, 6.5 - 12.5 Ton, and 15 - 20 Ton. All equipment must be installed and commissioned by qualified pros, especially with A2L refrigerant handling and electrical verification. Get dependable performance and value-focused pricing suited for commercial duty.

Top Brands for Straight Cool 3 - 20 Ton

We feature Daikin for proven light-commercial reliability, robust parts support, and compatible accessories across split and rooftop configurations.

Frequently Asked Questions

  • What is a straight cool system and when should I choose cool-only with electric heat?

    A straight cool system provides cooling only; choose cool-only with electric heat when your primary need is cooling and simple electric heat strips cover mild heating.

  • How do I size a 3-20 ton system for my building load?

    Have a contractor perform an ACCA Manual N/J load calculation; as a rough check, 1 ton ≈ 12,000 BTU, but final sizing must be based on the load.

  • Are these R-32 split systems compatible with my existing air handler or coil?

    Only when the air handler/coil is R-32 (A2L) rated and properly matched with the correct metering device; do not pair with R-410A-only equipment.

  • Do these systems require a licensed contractor for installation and startup?

    Yes. Professional installation is required for code compliance, A2L refrigerant handling, proper charging, and to maintain warranty coverage.

  • What electrical and breaker requirements are typical for 7.5-10 ton units?

    Most use 208/230V 3-phase or 460V 3-phase power. Size conductors and breakers per the unit nameplate MCA/MOCP and local electrical code.

  • Can I add electric heat strips to a cool-only split system and what sizes are available?

    Yes. Many air handlers accept field-installed heat kits, commonly 5-30 kW depending on model and voltage; verify airflow and circuit sizing.

  • What are the pros and cons of R-32 compared to R-410A for commercial applications?

    R-32 offers lower GWP and efficiency potential, but it is an A2L mildly flammable refrigerant requiring approved components and trained handling.

  • Are controls or thermostats included with these split systems or sold separately?

    Thermostats are typically sold separately; most units use standard 24V commercial stats and may integrate with BMS using available accessories.

  • How long can my line set be and how is refrigerant charge handled?

    Maximum equivalent line length and lift vary by model; additional charge per foot and piping details are specified in the installation manual.

  • Do rooftop installs require curb adapters or other accessories?

    Often yes when replacing older footprints; confirm curb size, economizer needs, and protective accessories before ordering.

Common FAQ Quick Education

Featured Videos