10 Questions to Ask When Replacing your HVAC System

Owning a home involves many responsibilities—one of the biggest is keeping your heating and cooling system in top shape. But what happens when part of your HVAC system starts failing, and the other seems fine? Should you replace just one unit, or is investing in a full HVAC replacement smarter? It's a great question.

If you've ever struggled with this decision, you're not alone. Below are some questions—and answers—we often hear from customers regarding full-system replacement. We hope the answers help you make the right choice for your home and budget.

Should You Replace Furnace and AC at the Same Time?

If your air conditioner is on the fritz and you need an air conditioning replacement, you might wonder: Should I go ahead and replace the furnace, too?

Here's our honest take: In most cases, investing in a full HVAC replacement is the smartest and most cost-effective choice. Modern systems are designed to work in tandem (often called a "matched pair") for optimal efficiency. If you replace one unit and not the other, your system efficiency may suffer, affecting your comfort and increasing your utility bills. Replacing both units at the same time is often the smart option because it may offer:

• Better energy efficiency
• Cost savings over time
• Lower utility bills
• Improved comfort
• Quieter operation
• A better-balanced system workload
• Improved temperatures and airflow
• Increased lifespan of systems
• Stronger warranty coverage (sometimes full systems come with better, more extended warranties)

Is a full replacement cost-effective?

Another concern homeowners have is the cost of full HVAC replacement. Many homeowners ask us: Is it cheaper to replace the furnace and the AC together?

In the long run, yes.

Bundling your replacement often reduces labor costs, helps avoid future service calls, and ensures long-term reliability, saving you money over time.

Is it risky to replace only one unit?

Yes, it can be. Your HVAC system is designed to work as a matched pair. (This means your furnace and air conditioner are engineered to operate together in size, efficiency, and control.)

So, suppose you mix an older furnace with a new high-efficiency AC unit (or vice versa). In that case, you may not have HVAC system compatibility and could experience:

• Airflow imbalances
• Inconsistent temperatures
• Inefficiency
• Comfort problems
• Shortened lifespan of equipment

Our technicians are always happy to assess your system and recommend the best option for your home.

How long do HVAC systems last?

On average, you can expect your air conditioning and furnace to last around 8 to 10 years. If you're unsure if a replacement is necessary, call us, and we can evaluate!

What else should I know about replacing my system?

Remember that many companies, including ARS, offer financing options on replacement systems. Full system replacements may qualify for 0% interest promotions or low monthly payments, making the upgrade more affordable. In addition, purchasing a new energy-efficient system may also qualify you for tax credits. Click here to learn more about the Inflation Reduction Act.