HVAC Services
Purisync Heating and Air operates six service categories from our 325 N Kirkwood Road location, covering residential and light-commercial HVAC across Kirkwood, Affton, Sappington, Webster Groves, Crestwood, and Town and Country. Every service category shares the same operating constraints: ACCA Manual J sizing for new equipment, calibrated diagnostic instruments on every service visit, written quotes itemized at the part-and-labor level, and hourly-paid NATE-certified technicians without commission incentives. What changes between categories is the equipment, the failure modes, the diagnostic protocol, and the seasonal demand pattern. Below is the full service catalog, organized by category.
Cooling Services
Cooling demand in Climate Zone 4A runs from approximately April 15 through October 15, with peak design conditions in late July: 94°F dry bulb temperature and 76°F coincident wet bulb at the St. Louis Lambert design point. Cooling load is approximately 70% sensible (temperature reduction) and 30% latent (humidity removal). Equipment selection that ignores the latent load fraction produces uncomfortable summer conditions even at the target thermostat setting.
The 2025 AIM Act transition added R-454B (Global Warming Potential 466) and R-32 (GWP 675) as the residential refrigerant replacements for R-410A (GWP 2,088). All new condenser sales effective January 1, 2025 use AIM Act compliant refrigerant. Legacy R-410A and R-22 service continues on equipment already in field operation.
Full cooling service category: /services/cooling/
- AC Installation — R-454B condenser and matched indoor unit installation with Manual J sizing, Manual S equipment selection, Manual D duct verification.
- AC Repair — diagnostic-driven repair with Yellow Jacket TitanHV gauge set readings, Fluke 902 FC clamp meter amperage, subcooling and superheat measurement, photo documentation.
- AC Tune-Up — spring preventive service with refrigerant charge verification, capacitor microfarad check, evaporator coil and condensate pan inspection, condenser coil cleaning.
- AC Capacitor Replacement — the most common cooling repair, typically $48–$180 parts plus diagnostic and labor.
- AC Compressor Repair — hard-start kit installation, contactor replacement, wired terminal inspection, and full compressor replacement for end-of-life equipment.
- Refrigerant Recharge — leak diagnosis and EPA Section 608 compliant refrigerant addition for R-410A, R-454B, R-32, and R-22 systems.
- Swamp Cooler Service — evaporative cooler service for the few remaining systems in older Kirkwood and Affton homes.
- Evaporator Coil Repair — leak detection, micro-channel coil service, mineral scale removal from Missouri American Water 10–12 gpg hardness, and full coil replacement.
Heating Services
Heating demand in Climate Zone 4A runs from approximately October 15 through April 15, with peak design conditions in January and February: 3°F ASHRAE 99% winter design temperature at the St. Louis Lambert design point. Annual Heating Degree Days approximately 4,400 against a 65°F base. Polar Vortex events (January 2019, February 2021, December 2022) drove temperatures into single digits and below zero, putting design-condition heating loads on equipment that’s normally operating at 30–50% capacity.
Gas-fired forced-air furnaces dominate the residential heating equipment mix in our six-city service area, with Spire Missouri natural gas delivery at 7" WC nominal pressure. Cold-climate heat pumps (Mitsubishi Hyper-Heat, Daikin Aurora, Bosch IDS Premium 2.0) provide AHRI-rated 100% capacity at 5°F outdoor temperature for homes without natural gas service or where Ameren Missouri heat pump rebates favor the electrification path. Hydronic boilers serve historic district homes in Meramec Highlands, Central Place, and Jefferson-Argonne where the original 1920s–1950s installation predates forced-air ductwork.
Full heating service category: /services/heating/
- Furnace Installation — gas furnace replacement across Carrier, Trane, Lennox, Bryant, Rheem, Goodman residential lines.
- Furnace Repair — combustion analysis with Bacharach Fyrite Insight Plus, gas pressure verification, ignition system diagnostics, inducer motor service, blower wheel and motor service.
- Furnace Tune-Up — fall preventive service with combustion analysis under 100 ppm CO air-free target, gas pressure verification, heat exchanger borescope inspection.
- Heat Pumps — cold-climate heat pump installation for Climate Zone 4A applications.
- Heat Exchanger Repair — Hawkeye inspection borescope verification of cracks, replacement coordination through manufacturer warranty channels.
- Boiler Installation — Burnham, Weil-McLain, Peerless, Buderus, Viessmann hydronic boilers.
- Boiler Repair — cast iron sectional, monobloc, and modulating-condensing boiler service across the historic Kirkwood and Webster Groves district housing stock.
- Gas Line Installation — black iron and CSST gas line installation tied to HVAC equipment, with Spire Missouri shut-off coordination.
Indoor Air Quality
The mixed-humid Climate Zone 4A produces specific indoor air quality challenges across the year. Summer brings elevated outdoor humidity that infiltrates through building envelope leakage and is incompletely removed by oversized cooling equipment. Winter forced-air heating dries indoor air to 15–20% relative humidity in older homes, well below the 30–40% comfortable range. Spring and fall ragweed and tree pollen levels in Missouri rank among the highest in the United States. IAQ service in our six-city area is not a one-size category — it’s seasonally driven, building-specific, and dependent on the existing forced-air system’s filtration position and air handler static pressure capacity.
Full indoor air quality service category: /services/indoor-air-quality/
- Duct Cleaning — NADCA-standard duct cleaning for biofilm, debris, and post-renovation cleanup.
- Humidifiers — whole-home humidifier installation sized to Missouri American Water 10–12 gpg hardness.
- Dehumidifiers — whole-home and crawlspace dehumidification for finished basements and humid-summer applications.
- Air Purifiers — HEPA-grade and electrostatic air purification, in-line with the forced-air system or standalone room units.
- UV Light Treatment — UV-C coil sanitization to control biofilm and microbial growth on evaporator coils and drain pans.
- Air Filter Replacement — MERV 8 through MERV 16 filtration with static pressure verification.
- Carbon Monoxide Testing — combustion analysis on gas-fired equipment, ambient CO testing, CO alarm placement consultation.
Maintenance
Preventive maintenance extends equipment service life, preserves manufacturer warranty validity on extended coverage programs, and identifies failures before they become emergency calls. The single highest-ROI HVAC decision a homeowner makes is committing to spring and fall tune-ups on the same schedule. Spring service catches refrigerant charge issues before peak summer load; fall service catches combustion issues before peak winter load.
Full maintenance service category: /services/maintenance/
- HVAC Tune-Up — spring AC and fall furnace preventive service with full instrumented inspection.
- HVAC Inspection — pre-purchase HVAC inspection for real estate transactions, insurance claims, or system performance evaluation.
- Emergency Repair — 24/7 emergency response across all six service area cities.
- Maintenance Plans — annual and biennial preventive maintenance contracts with priority dispatch, parts discount, and labor warranty extension.
Installation
Installation is a separate service category from cooling and heating because complete system replacement, ductless retrofits, zoning, smart thermostats, and air handler service involve scope and process distinct from equipment-only repair. A complete HVAC replacement quote starts with ACCA Manual J load calculation, Manual S equipment selection, and Manual D duct verification — not with a salesperson asking what brand you prefer.
Full installation service category: /services/installation/
- HVAC Replacement — complete forced-air system replacement (furnace, condenser, evaporator coil, line set) with Manual J/S/D documentation.
- Ductless Mini-Splits — Mitsubishi Hyper-Heat, Daikin Aurora, and Bosch IDS ductless installation for historic district homes where adding ductwork is impractical.
- Zoned HVAC — multi-zone forced-air systems for two-story and multi-level homes.
- Smart Thermostats — ecobee Premium, Nest Learning, Honeywell T-Series installation with C-wire verification.
- Thermostat Repair — thermostat replacement, wiring diagnosis, C-wire installation on legacy systems.
- Air Handler Services — air handler installation, blower wheel service, ECM motor replacement, drain pan service.
Commercial
Light-commercial HVAC across the six-city service area covers retail storefronts on Manchester Road and Big Bend Boulevard, small office buildings, restaurants, medical and dental practices, and small manufacturing facilities. Equipment scope ranges from 3-ton rooftop package units to 25-ton multi-zone systems with economizers, energy recovery ventilators, and building automation control integration.
Full commercial service category: /services/commercial/
- Commercial HVAC — service overview for retail, restaurant, office, medical and dental, and small industrial applications.
- Commercial HVAC Maintenance — quarterly and semi-annual preventive maintenance with documented service intervals.
- Rooftop Units — Carrier, Trane, Lennox, and York rooftop package unit installation and service.
- Service Contracts — commercial maintenance contracts with priority response, parts inventory commitments, and budget-friendly fixed pricing.
How to Choose the Right Service Category for Your Need
If you’re not sure which service category applies to your situation, the simplest approach is to call (314) 338-5111 and describe the symptom. The dispatcher will route the call to the appropriate service category based on the issue:
- “My AC isn’t blowing cold air” → cooling diagnostic visit.
- “My furnace won’t turn on” or “my heat is short cycling” → heating diagnostic visit.
- “My family is sneezing more this winter than last winter” → indoor air quality consultation.
- “My system is 16 years old and I’m considering replacement” → installation quote with Manual J calculation.
- “I want to extend the life of my equipment” → maintenance plan or seasonal tune-up.
- “My restaurant rooftop unit isn’t cooling the dining room” → commercial diagnostic visit.
Frequently Asked Questions
- What service categories does Purisync operate?
- Six categories: cooling (R-454B AC installation, repair, tune-up, capacitor, compressor, refrigerant, swamp cooler, evaporator coil), heating (gas furnace, cold-climate heat pump, heat exchanger, boiler, gas line), indoor air quality (humidifier, dehumidifier, air purifier, UV-C, MERV filtration, carbon monoxide), maintenance (tune-up, inspection, emergency repair, maintenance plans), installation (HVAC replacement, ductless mini-splits, zoned, smart thermostat, thermostat repair, air handler), and commercial (rooftop units, retail and restaurant, small office, maintenance contracts). All operated from our 325 N Kirkwood Road location.
- How do cooling and installation services differ?
- Cooling services (AC repair, capacitor replacement, refrigerant recharge) focus on equipment in field operation — diagnose the failure, fix the specific issue, return the system to operating spec. Installation services involve complete system replacement, system additions (ductless mini-splits, zoning), or major modifications (smart thermostat C-wire installation, air handler service). The diagnostic and quote process differs: cooling repair quotes itemize parts and labor on a known repair scope; installation quotes start with ACCA Manual J load calculation, Manual S equipment selection, and Manual D duct verification before equipment is selected.
- What’s the difference between IAQ and maintenance services?
- Indoor air quality services address comfort and health concerns beyond temperature control — humidity, particulate filtration, microbial control, allergen reduction, carbon monoxide monitoring. Maintenance services focus on preserving equipment performance and reliability through preventive inspection and service. The two categories overlap: a fall furnace tune-up includes combustion analysis (which detects carbon monoxide issues) and a spring AC tune-up includes evaporator coil and drain pan inspection (which catches microbial growth). For a homeowner with specific allergy or humidity concerns, the IAQ category is the entry point. For preserving warranty validity and catching failures before they become emergencies, maintenance is the entry point.
- Which service category applies to a complete system replacement?
- Installation. A complete HVAC system replacement (furnace, condenser, evaporator coil, line set, possibly thermostat and ductwork modifications) is the installation service category, not cooling or heating. Installation quotes begin with ACCA Manual J load calculation using Wrightsoft Right-J software with St. Louis Lambert climate data (Climate Zone 4A, 3°F winter design, 94°F dry bulb summer design with 76°F coincident wet bulb). Manual S equipment selection then matches AHRI-rated equipment within 0–15% of calculated load. Manual D duct verification confirms existing ductwork can handle the new equipment’s blower capacity at design friction rate 0.05–0.08 inches WC per 100 feet equivalent length.
- Does Purisync handle commercial HVAC for restaurants and retail?
- Yes. Light-commercial HVAC across the six-city service area covers retail storefronts on Manchester Road and Big Bend Boulevard, small office buildings, restaurants, medical and dental practices, and small manufacturing facilities. Equipment scope ranges from 3-ton rooftop package units to 25-ton multi-zone systems with economizers, energy recovery ventilators, and building automation control integration. Commercial maintenance contracts with quarterly or semi-annual service intervals are available with priority response and fixed pricing through the year. Larger industrial applications outside our crew capacity get referred to specialty commercial contractors with established credentials.
Contact Purisync Heating and Air
To schedule service in any of the six categories, contact our 325 N Kirkwood Road office. Tess answers during business hours and routes calls to the appropriate service category. James personally takes the after-hours emergency line for cooling and heating failures.
- Emergency Line (24/7): (314) 338-5111
- Address: 325 N Kirkwood Rd #245, Kirkwood, MO 63122
- Email: info@purisyncheatingairconditioning.xyz
- St. Louis County Mechanical Contractor License: #MC-2014-08439-STL
- Kirkwood Business Registration: #BL-2014-1187
- EPA Section 608 Universal: #608U-2014-385721
Office Hours
- Emergency Service: 24 hours a day, 7 days a week
- Office Staff: Monday – Saturday, 9:00 AM – 5:00 PM
- Closed: Sundays and State/Federal Holidays (emergency line always active)