Expert Tips for Choosing Your HVAC System: Buying Guide

The Qual-Tech AC Buying Guide

Choosing the right AC system is critical in Arizona’s intense heat. This AC buying guide highlights the key factors that matter most for comfort, efficiency, and long-term value in your home.

Unit Tonnage

If the unit is too small, it won’t cool properly. Too large, and it cycles inefficiently and wears out faster. Correct sizing is the single most important factor—it affects comfort, energy use, and equipment life. If you want to know how much cooling you need, then you refer to your home’s square footage.

1.5 tons – up to 600 sq ft
2.0 tons – 600 to 1,000 sq ft
2.5 tons – 1,000 to 1,200 sq ft
3.0 tons – 1,200 to 1,500 sq ft
3.5 tons – 1,500 to 1,800 sq ft
4.0 tons – 1,800 to 2,100 sq ft
5.0 tons – 2,100 to 2,500+ sq ft

Note that these numbers are very approximate. A Manual J load calculation from an HVAC pro gives the most accurate sizing.

Efficiency Ratings

In Arizona’s extreme heat, high SEER2 ratings are especially valuable. They measure energy efficiency—higher numbers mean lower cooling costs. A high-efficiency unit is worth the investment if you use your AC often or plan to stay long-term.

High-efficiency units are ideal when:

You live in a hot climate (like Arizona)
High energy bills are a concern
You want long-term savings over upfront cost
You plan to keep the home 5+ years

System Type

Choosing the right AC system type is one of the most important decisions for comfort and cost. In Arizona’s heat, the wrong choice can mean uneven cooling, energy waste, or unnecessary expense. Your home’s size, layout, and whether it has ductwork will determine which system is the best fit.

Central Air (Forced Air)
Great for large homes with ducts. Delivers consistent cooling to all rooms and works with existing HVAC infrastructure.

Ductless Mini-Split
Ideal for homes without ducts or for room additions. Energy-efficient and allows independent temperature control per room.

Window Unit
Budget-friendly option for cooling a single room. Easy to install and remove, great for apartments or temporary needs.

Other AC Buying Factors to Look Out For

Two-Stage or Variable-Speed Compressor

More efficient and better at maintaining consistent indoor temperatures—great for Arizona’s long cooling season.

Air Handler & Ductwork Compatibility

Your new AC should match your air handler and duct system. Undersized or leaky ducts reduce efficiency and strain the system.

Warranty & Brand Reliability

Stick with brands tested in desert climates. A strong manufacturer warranty (10+ years) protects your investment.

Maintenance Accessibility

Our certified technicians focus on quality AC repair services. They have no incentive to upsell customers.

what makes QUAL-TECH different?

The values we live by

Honesty & Integrity

Our technicians are not salesmen. They fix air conditioning systems and provide an unbiased assessment of your system's condition.

Customer-Focused

Our philosophy is based on treating customers the way you want to be treated. Your comfort and budget are our top priorities.

Quality-First Approach

When your technicians are focused on quality work, you take the time to do the job right. Everyone's happy.

Customer Protection

We're licensed, bonded, and insured for YOUR protection first. And of course, our work is guaranteed.

Contact Qual-Tech for Residential AC Service Now!

Don’t let the summer heat take a toll on your comfort. Contact us today for reliable residential AC service and enjoy the difference that expert care can make. Our experienced technicians are here to ensure your home stays cool, comfortable, and energy-efficient all season long. Regain your peace of mind and beat the heat—schedule your AC service today.