How to install central air to existing furnace in Neptune NJ

bryanedwards651
Oct 9
4 min read

If you live in Neptune, NJ, and are considering upgrading your home comfort system, installing central air conditioning alongside your existing furnace is a smart way to ensure year-round climate control. Many homeowners wonder if this is a complex process or if they need professional help. In this blog, we’ll guide you through the essential steps for integrating central air with your existing furnace while highlighting the role of experienced furnace installers.

Whether you are searching for “furnace installation near me” or looking to understand the process before hiring professionals, this guide provides all the information you need.

Why Add Central Air to Your Existing Furnace?

Many homes in Neptune, NJ, already have furnaces for heating, but lack a centralized cooling solution. Adding central air to your existing furnace has several advantages:

Cost-Effective: Utilizing your existing ductwork and furnace saves on installation costs.
Improved Comfort: Central air distributes cool air evenly throughout your home.
Increased Home Value: Homes with HVAC systems are more attractive to buyers.
Energy Efficiency: Modern central air systems, when paired with your furnace, can help reduce your energy bills.

Before you start, it’s essential to determine whether your current furnace is compatible with central air conditioning. Most modern gas or electric furnaces can accommodate an air handler or evaporator coil.

Tools and Materials Needed

Before installation, ensure you have the necessary tools and equipment:

Evaporator coil and air handler (matched to your furnace)
Copper refrigerant lines
Condenser unit for outdoor installation
Thermostat compatible with central air
Electrical wiring and disconnect box
Ductwork adapters (if needed)
HVAC tools: drill, wrenches, tubing cutter, flaring tool, and vacuum pump

While some handy homeowners may attempt DIY installation, hiring experienced furnace installers is recommended for safety, efficiency, and proper handling of refrigerant.

Step-by-Step Guide to Installing Central Air

1. Assess Your Existing Furnace

Start by checking your current furnace. You need to:

Ensure the furnace blower is compatible with an air handler.
Measure your existing ductwork to determine if it can handle the added airflow.
Check for any required upgrades to electrical connections or gas lines.

A licensed furnace installer can perform this assessment to ensure your furnace is capable of handling central air.

2. Install the Evaporator Coil

The evaporator coil is installed on the supply side of your furnace. Here’s how:

Turn off the power to the stove.
Remove the existing access panel and prepare the area for the coil.
Place the evaporator coil above the furnace or in the plenum.
Connect the coil to the ductwork using the provided adapters.

The coil must be installed with precise alignment to avoid leaks and ensure optimal airflow.

3. Set Up the Outdoor Condenser Unit

The condenser, which houses the compressor, is installed outside:

Select a flat, stable surface, preferably one that is clear of debris and out of direct sunlight.
Connect the refrigerant lines from the indoor evaporator coil to the condenser.
Ensure proper insulation of refrigerant lines to prevent energy loss.

Professional furnace installers often handle refrigerant connections, as mishandling refrigerants can be dangerous.

4. Connect the Electrical System

Central air requires electrical power:

Install a disconnect box near the outdoor condenser.
Connect the wiring from the furnace and thermostat to the condenser unit.
Double-check voltage compatibility and safety codes.

5. Install the Thermostat

Modern thermostats control both heating and cooling:

Mount the thermostat in a central location, away from direct sunlight and heat sources.
Connect wires according to the manufacturer’s instructions.
Program your thermostat for both heating and cooling cycles.

6. Test the System

Once everything is connected:

Turn on the furnace blower and the condenser.
Check airflow from vents and ensure cooling efficiency.
Inspect all connections for leaks or electrical issues.

Proper testing ensures long-term system performance and energy efficiency.

Tips for Homeowners in Neptune, NJ

Hire Licensed Professionals: Even if you are handy, some steps require the expertise of licensed professionals to comply with safety regulations.
Check Permits: Neptune may require permits for HVAC modifications. Always confirm local building codes.
Energy Efficiency Matters: Opt for ENERGY STAR-rated air conditioners to save money over time.
Regular Maintenance: Schedule annual inspections for your furnace and central air system to prolong lifespan.

Cost Considerations

Adding central air to an existing furnace can vary depending on:

Size and age of the furnace
Ductwork condition
Brand and efficiency of the AC unit
Labor costs in Neptune, NJ

Homeowners typically spend between $3,500 and $7,500 for complete installation, including parts and labor. Searching for “furnace installation near me” will help you compare local installers and get accurate quotes.

Choosing the Right Furnace Installers

Not all installers offer central air integration services. When hiring:

Look for licensed and insured furnace installers in Neptune, NJ.
Check customer reviews and past project references to ensure the quality of our work.
Ask about warranties on labor and equipment.
Compare multiple quotes to ensure competitive pricing.

Conclusion

Installing central air with your existing furnace in Neptune, NJ, is an excellent way to enjoy comfortable indoor temperatures throughout the year. While a skilled homeowner can do some steps, hiring professional furnace installers ensures safety, efficiency, and long-term reliability.

If you’re considering this upgrade, start by searching for “furnace installation near me” to find a trusted local professional who can assess your current system, provide a detailed quote, and complete the installation professionally.

Investing in central air paired with your existing furnace not only increases comfort but also adds value to your home and helps reduce energy costs in the long run.