Seasonal tune-up and full diagnostic on your Carrier, Trane, or Goodman system - readings shown to you before any repair is proposed
Diagnosis first, numbers second - you approve the repair price before a single part goes in.
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AfterFast, Reliable AC Installation Across Lilburn
AC installation in Lilburn typically runs $3,500-$7,500 for a complete split system with load calculation and existing ductwork, and most jobs are scheduled within a few days after your free estimate. We’re Coldharbour Heating & Air, and our AC Installation team works the Yellow River corridor regularly - from Old Town Lilburn out to the ranch properties along Rockbridge Road and the subdivisions near Killian Hill. Because Lilburn’s housing stock was built largely between 1972 and 1990, we’re in the middle of a replacement wave: original single-stage condensers, degraded flex duct, and in many neighborhoods, propane or all-electric heat sources that complicate a simple swap. Call (817) 402-2972 to book a free estimate. A live person answers the phone 24 hours a day.
Why Coldharbour Heating & Air Is Lilburn’s Preferred AC Installation Company
We’ve been serving Gwinnett County since 2003 as an independently owned and operated member of the Kingswell network, and Lilburn is one of our most frequent stops. The Kingswell Way means we give you a written price before any work begins, show up in the window we promised, leave the job site clean, put our guarantee in writing, and come back if it fails.
Our 365-Day Done Right Promise applies to every repair: if a repair fails within a full year, we return and correct it at no charge, and that guarantee is written down before the technician leaves. For installation work, we provide a fixed written price, a scheduled install date, and we handle rebate and financing paperwork. Our technicians are background-checked, uniformed, and trained on nine major residential HVAC brands - Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard - so whoever shows up can work on whatever system is in your home.
Dispatch and scheduling are coordinated from our Atlanta office, but our crews live and work in this area. We know the difference between a 1978 crawl-space ranch near the Yellow River and a 1995 two-story colonial off Lawrenceville Highway, and we size accordingly. That local knowledge matters when you’re replacing a system that was installed before Gwinnett’s natural-gas mains reached this far out.
Heat Pump Installation in Lilburn
Heat Pump Installation in Lilburn often means replacing a propane furnace or an all-electric air handler alongside the outdoor condenser, because a meaningful share of properties here were built before natural gas pushed this far out the Yellow River corridor. A heat pump moves heat rather than generating it: in cooling mode it works like a standard AC, and in heating mode it extracts warmth from outdoor air to send inside. For Lilburn’s mild winters, a properly sized heat pump can handle the full heating load down to roughly 35°F before supplemental heat kicks in, which cuts propane deliveries or electric-resistance bills significantly.
The cost for a complete heat pump installation in Lilburn runs $3,500-$7,500, same as a standard split system, because the outdoor unit and indoor coil replacement are comparable. The difference is in the indoor air handler: if you’re converting from propane, we remove the furnace, seal the combustion venting, and install an electric air handler with a heat-strip kit for backup. If you’re replacing an existing heat pump, we match the refrigerant lines and verify the defrost board settings for our humidity.
Propane Conversion Load Calculations
Switching from propane to a heat pump requires a full Manual J load calculation, not just a tonnage swap. We measure the home’s envelope, window efficiency, and duct leakage, then size the heat pump for both the cooling load and the heating load at Lilburn’s design temperature. Oversizing causes short cycling and poor humidity control; undersizing leaves you cold in January. We run the numbers every time.
SEER2 Ratings and Humidity Control
Modern heat pumps are rated under SEER2 standards, which test at more realistic static pressures than the old SEER protocol. For Lilburn’s humid Piedmont climate, we typically specify 14.3 SEER2 or higher, because the longer run cycles at lower fan speeds pull more moisture out of the air. That matters in crawl-space homes where the Yellow River watershed keeps ambient humidity elevated.
Ductless Mini Split Installation in Lilburn
Ductless Mini Split Installation in Lilburn solves problems that standard ducted systems cannot: outbuildings with no duct run, workshops off the main house, room additions over garages, and homes where the original flex duct is too degraded to salvage. A mini split pairs an outdoor compressor with one or more indoor wall- or ceiling-mounted air handlers, connected by a small refrigerant line set through the exterior wall. No ductwork. No crawl-space trunk to leak.
A single-zone mini split installation in Lilburn runs $3,500-$7,500, depending on the unit’s BTU capacity and the length of the line set. For a detached workshop or garage, we size the outdoor unit for the actual space and insulation level, not the main house. Multi-zone systems cost more per zone but eliminate the need for multiple outdoor units cluttering your property.
Outbuilding and Workshop Conditioning
We regularly install mini splits for Lilburn homeowners who want a conditioned workshop, art studio, or garage without tapping into the main house’s duct system. The outdoor unit mounts on a concrete pad or wall bracket, and the indoor unit hangs high on the interior wall, out of the way. We run power and refrigerant lines underground in conduit where needed, and we size for the building’s exposure - a metal workshop with no insulation needs a different load calculation than a framed garage with R-13 walls.
Historic and Retrofit Applications
In Old Town Lilburn, some homeowners use mini splits to preserve original floor plans without adding soffits or chases for ductwork. The indoor units are quiet, and modern inverter-driven compressors ramp up and down rather than blasting on and off. That efficiency shows up on the electric bill, and it avoids the static-pressure problems we see in homes where 1970s flex duct has been patched multiple times.
Trusted Brands We Service in Lilburn
Our technicians are trained to install and service Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard. We stock common parts for Trane, Lennox, Goodman, and Rheem locally, which means faster turnaround when a Lilburn homeowner needs a warranty compressor or a replacement coil. For new installations, we recommend equipment based on your home’s specific load calculation, not brand loyalty. A 14.3 SEER2 Goodman properly sized and ducted will outperform a 16 SEER2 unit that’s oversized and starved for airflow. We match the equipment to the house, and we put that in writing.
Common AC Installation Problems We See in Lilburn Homes
- Short cycling on exposed rural lots. Lilburn properties with no tree cover or wind shelter face higher solar gain and greater heat loss. A contractor who sizes for square footage alone installs a unit that blasts cold air and shuts off before dehumidifying, leaving the house clammy in July and wearing out the compressor.
- Flex duct patched by non-permitted work. In the Yellow River-area subdivisions, we routinely find original 1970s crawl-space systems with hybrid mixes of rigid and flex duct, sagging trunks, and disconnected collars. New equipment on bad ductwork still won’t cool the far bedrooms.
- Ignoring the propane furnace in the quote. Because natural gas came late to this corridor, many Lilburn homes still run propane. A quote that only prices the outdoor condenser leaves the homeowner with a mismatched indoor coil and no plan for the heating season.
- Outbuildings left to window units. We see 1,400 sq ft ranches with a $6,000 main-house system and a 120 sq ft workshop sweating through August with a noisy window shaker. A properly tonnaged mini split costs less than most homeowners expect and runs quieter and more efficiently.
Pricing for AC Installation in Lilburn, GA
We’re upfront about numbers because “call for pricing” wastes everyone’s time. Here’s what AC installation costs in Lilburn’s market:
| Service | Price Range |
|---|---|
| AC Installation (standard split system, with load calculation and existing duct) | $3,500-$7,500 |
| Heat Pump Installation replacement (propane or electric heat source, Yellow River corridor properties) | $3,500-$7,500 |
| Ductless Mini Split Installation (single-zone, outbuilding or workshop) | $3,500-$7,500 |
| AC Repair (diagnostic, capacitor, refrigerant charge) | $150-$650 |
| Tune-Up before install decision | $80-$200 |
What moves the number within those ranges? The size of the equipment, the condition of your existing ductwork, whether we’re converting from propane or replacing like-for-like, and whether the electrical panel needs upgrading for a heat pump or multi-zone mini split. We give you a written fixed price after the load calculation, not before we know what we’re looking at. Estimates are free. Call (817) 402-2972 to schedule.
We Also Serve Cities Near Lilburn
Our crews work throughout Gwinnett County and beyond. If you’re in Lilburn or nearby Snellville, Lawrenceville, Grayson, or Buford, the same scheduling team and the same Kingswell standards apply. Each area has its own housing stock and climate quirks - Snellville’s later build-out means different equipment ages, Lawrenceville’s density changes access - but our load-calculation and written-price process stays consistent.
Serving Lilburn, GA - Our Local Coverage Area
We’re based in the Lilburn area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About AC Installation in Lilburn
Yes. A propane system means we evaluate the entire heating and cooling setup, not just the outdoor condenser. We calculate whether a heat pump can handle your winter load, size the electric air handler or keep propane backup, and price the conversion in one written quote. Call (817) 402-2972 and we’ll walk through your options.
We run a Manual J load calculation that factors solar exposure, wind exposure, and infiltration rates for exposed lots. Unsheltered properties gain more heat in summer and lose more in winter, so the calculation matters more than square footage alone. An exposed ranch off Five Forks Trickum Road needs a different sizing approach than a shaded lot in Old Town Lilburn.
Yes. A ductless mini split is usually the right solution for outbuildings. We size the unit for the building’s insulation and use, run power and refrigerant lines properly, and install a dedicated outdoor unit or zone off a multi-port compressor. Single-zone mini split installation in Lilburn runs $3,500-$7,500. Call for a free estimate.
No, but it means we need to test the ductwork before quoting equipment. We measure static pressure, check for disconnected or sagging flex runs, and determine whether the trunk can support a modern variable-speed air handler. Sometimes we rebuild sections in rigid duct; sometimes a mini split bypasses the problem entirely. We’ll show you the pressure readings and explain your options before you decide.
SEER2 is the current federal efficiency rating, tested at higher static pressure than the old SEER standard to better reflect real-world duct systems. For Lilburn’s humid climate, a higher SEER2 unit with a variable-speed blower runs longer at lower speeds, which removes more moisture and prevents the clammy feeling of an oversized system short cycling. We explain the payback math on your written quote so you can choose based on your budget and how long you plan to stay in the home.
Written by Victor Mancini, Owner at Coldharbour Heating & Air, serving Lilburn since 2003.