Central Air Conditioning Buying Guide

On February 25, 2026 By newsroom Topic: Appliance Buyers Guide

Upgrading or installing a central AC system is a major investment. Here's a breakdown to help you make the best choice, from system types to maintenance and contractor selection.

Types of Air Conditioning Systems

Ducted Systems
- How It Works: Cooled air is distributed throughout your home via ducts. A split system includes an indoor coil and an outdoor condenser/compressor.
- Pros: Whole-home cooling; consistent temperatures; controlled by a thermostat.
- Cons: Requires existing or new ductwork.

Ductless Split Systems
- How It Works: An outdoor compressor connects to one or more indoor air handlers via a conduit.
- Pros: Quieter and more efficient than window units; easier to install in homes without ducts.
- Cons: Limited to specific rooms; higher upfront costs.

Heat Pumps
- How It Works: Provides both heating and cooling by transferring heat to/from the home.
- Pros: Highly energy-efficient; works in a variety of climates; may qualify for rebates.
- Cons: Higher upfront costs; performance may drop in extremely cold temperatures.

Key Factors to Consider

System Size (Capacity)
- Measured in British Thermal Units (Btu/hr.) or tons (1 ton = 12,000 Btu/hr.).
- Tip: Oversized systems can waste energy and struggle with humidity, while undersized ones won’t cool effectively. Have a contractor perform a Manual J calculation to determine the correct size.

Efficiency (SEER Rating)
- The Seasonal Energy Efficiency Ratio (SEER) measures efficiency. Higher SEER = better energy savings.
- Minimum SEER: 14.0 (U.S.); Energy Star Models: 15+ SEER.
- Tip: Higher SEER systems cost more but save on electricity bills over time.

Noise Level
- Look for models with lower decibel ratings for quieter operation.

Reliability
- Reliable systems reduce repair costs and last longer. Check ratings and owner satisfaction data for brands.

Installation Considerations

Ductwork: Ensure ducts are correctly sized, sealed, and insulated. Poor ducts can waste 20–30% of energy.
Placement: Outdoor compressors need 2–3 feet of clearance on all sides and 5 feet above for airflow.
Local Codes: Check building codes for compressor placement near property lines or windows.

Maintenance Tips for Longevity

Annual Professional Service
- Clean and flush coils.
- Inspect refrigerant levels and check for leaks.
- Vacuum blower compartments and inspect all components.

DIY Maintenance
- Clean or replace filters every 1–3 months.
- Clear debris from outdoor units.
- Keep grilles and vents clean.

Refrigerant
- Older systems using Freon (R-22) should be inspected for leaks or replaced with modern, eco-friendly systems.

Programmable Thermostats for Efficiency

Energy Savings: Setting a smart thermostat at 78°F can save 10% on cooling costs.
Fan Use: Ceiling or box fans can help lower perceived temperatures by 3–4°F.

Choosing the Right Contractor

Referrals and Reviews: Ask neighbors, family, or colleagues. Check Better Business Bureau and local consumer affairs records.

Certifications: Look for certifications from groups like North American Technician Excellence (NATE).

Detailed Quotes: Request a printout of calculations for cooling capacity (Manual J) and ductwork design (Manual D). Avoid contractors relying on rough estimates.

Warranty and Service Plans: Negotiate for warranties and service plans for regular maintenance.

Summing it up

Investing in central AC can enhance comfort and energy efficiency in your home. Whether you choose a traditional ducted system, a ductless setup, or an energy-efficient heat pump, proper installation, maintenance, and contractor selection are key to getting the most out of your system.