Central Air Conditioners

SEER ratings directly impact how much you spend on electricity every month. Higher numbers mean more cooling per dollar spent on power. A 16 SEER unit cuts electricity use by 25% compared to a 13 SEER model. Anything under 14 SEER burns through cash during the summer months. Hot climate homeowners should target 18+ SEER ratings for meaningful savings.

Standard compressors operate like a hammer. They slam on at maximum power, then shut off completely. Variable-speed technology lets the compressor ramp up gradually and run at exactly the right capacity for current conditions. This creates steady temperatures without wild swings and removes humidity more effectively. The technology costs more upfront, but can slash summer electric bills by $400-$600 per year.

Single-stage units blast cold air until your thermostat says stop, then shut off completely. Two-stage systems run at 65% capacity most of the time, only hitting full power on really hot days. Working with manufacturers taught me that two-stage operation cuts humidity better and creates more even temperatures. Test data shows 30% less temperature swings compared to single-stage units.

R-410A refrigerant works in most current systems but is being phased out starting in 2025. R-32 refrigerant runs in newer models and cools more efficiently while causing less environmental damage. I've watched manufacturers transition their product lines to R-32 because it performs better and meets future regulations. Choose R-32 if you're buying new; it'll be supported longer.

Signs: Warm air from vents, unit running but no cold air, or none at all

Try these first:

• Check thermostat is set to heat mode
• Replace the air filter if dirty
• Check circuit breakers
• Make sure the outdoor unit has power (check the outdoor disconnect)

Call someone when: Basic fixes don't work, you hear refrigerant hissing, or electrical components look damaged

Signs: Noticable temperature differences between rooms, some areas too hot while others are comfortable

Try these first:

• Check that all vents are open and unblocked
• Replace dirty air filters
• Make sure return vents aren't blocked

Call someone when: The issues persist after basic fixes – could be ductwork sizing or refrigerant flow issues

Signs: Grinding, squealing, hissing, or loud banging when the air conditioner runs

Try these first:

•  Check for loose panels
• Clear debris from the outdoor unit 
• Tighten any loose screws

Call someone when: Grinding, squealing, or refrigerant leaks continue – compressor problems or refrigerant issues need professional attention

What central AC units cost:

• Equipment costs: $2,500-$6,000 for the air conditioner itself
• Installation costs: $1,000-$2,500, depending on complexity
• Total investment: $3,500-$8,500 for most installations

As you're getting quotes for central air, ask each HVAC company these questions:

• What Manual J calculation software do you use for sizing?
• Can you show me the SEER rating and efficiency details?
• What's included in your installation warranty?
• How do you handle refrigerant line sizing and insulation?
• What ongoing maintenance do you recommend?

Consider how central air conditioners work with other HVAC components:

• Furnaces: Share ductwork and blower, creating complete heating/cooling systems
• Heat pumps: Alternative that provides both heating and cooling in one unit
• Air handlers: Indoor units that work with heat pumps or packaged systems
• Thermostats: Smart models optimize cooling schedules and energy usage
• Air purifiers: Add-on systems that improve indoor air quality during coolingYour heat pump connects to other systems:

Need help picking the right central air conditioner for your home? Smart HVAC USA connects you with local contractors who size systems correctly and recommend equipment that fits your house and budget.