The Complete Guide to Buying Cooling Equipment Online

How to choose the right air conditioner, heat pump, or cooling system for your home or commercial project

Choosing the right cooling equipment affects your comfort, energy bills, and system longevity for the next 15–20 years. Whether you are replacing a failed condenser, installing a complete split system for new construction, or upgrading a hotel property with PTAC units, understanding the differences between system types, efficiency ratings, and refrigerant options ensures you buy the right air conditioner the first time and avoid costly sizing mistakes.

Split Systems vs. Package Units: Which Is Right for Your Building?

A split system air conditioner separates the components into an outdoor condenser and an indoor air handler or furnace, connected by refrigerant lines. This is the most common residential configuration and offers the widest range of efficiency options, typically from 14 to 20+ SEER2. Split systems are ideal for site-built homes with mechanical closets, attics, or basements where indoor equipment can be installed and connected to existing ductwork.

An AC package unit combines the condenser, compressor, and air handler in a single outdoor cabinet. Package systems connect directly to ductwork through the wall or roof, eliminating the need for indoor equipment space. They are the standard choice for manufactured homes, mobile homes, slab-on-grade construction, and commercial rooftop applications. While package units generally carry slightly lower SEER2 ratings than top-tier split systems, their simplified installation and lower labor costs make them an extremely cost-effective solution.

Ductless Mini Splits: Zoned Cooling Without Ductwork

Ductless mini split systems deliver heating and cooling to individual rooms or zones through compact wall-mounted, ceiling-mounted, or concealed duct indoor units. Each indoor unit connects to an outdoor compressor via a small conduit — typically 3 inches in diameter — carrying refrigerant lines and a condensate drain. Single-zone systems pair one indoor unit with one outdoor unit. Multi-zone systems connect multiple indoor units (up to 5 or more) to a single outdoor compressor, providing independent temperature control for each space.

Mini splits are especially popular for room additions, converted garages, older homes without ductwork, sunrooms, and commercial spaces like server rooms and retail shops where precise zone control is required. Modern inverter-driven mini splits achieve SEER2 ratings above 20, making them among the most energy-efficient cooling systems available. Not sure if a mini split is right for your project? Read our guide: What Is a Mini Split and How Does It Work?

PTAC Units: Single-Room Cooling for Hotels, Apartments & Healthcare Facilities

Packaged Terminal Air Conditioners (PTACs) are self-contained, through-the-wall units that provide individual room heating and cooling without ductwork. Installed in a standard 42" wall sleeve, PTACs are the industry standard for hotels, motels, assisted living facilities, dormitories, and apartment buildings. They offer per-room temperature control, straightforward installation, and easy chassis replacement. PTAC units range from 7,000 to 15,000 BTU and are available in cooling-only with electric heat or heat pump configurations suited to milder climates. For a full breakdown of how these units work and where they perform best, see our complete PTAC guide.

Bard Wall-Mount Units: Through-the-Wall Cooling for Specialized Applications

Bard Manufacturing produces self-contained, through-the-wall HVAC units engineered for applications where conventional split systems or package units are impractical. Bard wall-mount units are widely used in telecom shelters, modular buildings, portable classrooms, guard shacks, and small commercial spaces requiring reliable, unattended climate control. Unlike PTACs, Bard units are available in higher capacities — from 1.5 to 5 tons — designed for 24/7 operation in harsh environments. They are manufactured in the USA and supported by an extensive dealer and parts network.

Understanding SEER2 Ratings and Air Conditioner Efficiency

SEER2 (Seasonal Energy Efficiency Ratio 2) replaced the original SEER metric in January 2023 under updated U.S. Department of Energy testing standards. The updated test procedure applies higher external static pressure to better simulate real-world duct conditions, so SEER2 numbers are slightly lower than the equivalent SEER rating for the same equipment. A system previously rated at 16 SEER, for example, may carry a 15.2 SEER2 rating under the new standard. Higher SEER2 numbers still indicate greater efficiency, and the federal minimum for new residential equipment is 14 SEER2 in the Southeast and Southwest regions.

For homeowners in warm climates with extended cooling seasons — including Florida, Texas, Arizona, and the Gulf Coast — investing in equipment rated 16 SEER2 or higher typically recovers the additional upfront cost within 3–5 years through lower monthly utility bills. Variable-speed and inverter-driven systems deliver the highest SEER2 ratings (18–20+) while providing quieter operation and superior humidity control. For a full breakdown of current efficiency standards, refrigerant rules, and available tax credits, see our 2026 Air Conditioner Buying Guide.

Refrigerant Types: R-410A, R-32, and R-454B Explained

The HVAC industry is actively transitioning from R-410A to lower global warming potential (GWP) refrigerants. R-32 and R-454B are the two primary replacements being adopted across residential and light commercial product lines. R-32 has a GWP of 675, approximately 68% lower than R-410A's GWP of 2,088. R-454B has a GWP of 466, roughly 78% lower. Both are classified A2L (mildly flammable), requiring updated installation practices and compliance with current local building codes. Goodman, Rheem, Bosch, Daikin, and other major brands have released complete R-32 and R-454B product lines across their split systems, package units, and ductless mini splits. R-410A equipment remains available and fully serviceable, but new installations are increasingly shifting to these next-generation refrigerants.

How to Size a Cooling System Correctly

Correct system sizing determines long-term performance, energy efficiency, and equipment lifespan. An oversized air conditioner short-cycles, wastes energy, and leaves indoor humidity uncomfortably high. An undersized system runs continuously without reaching the set temperature. The industry standard is a Manual J load calculation, which accounts for square footage, ceiling height, insulation values, window area and orientation, occupant count, and local design temperatures. Skipping this step is the most common — and most costly — mistake buyers make when purchasing cooling equipment online. You may also qualify for rebates and tax credits on qualifying high-efficiency equipment — visit our Rebate Center to explore available offers before you order.