HVAC Installation Services in Kirkwood and West St. Louis County

HVAC installation is where the largest single decisions in residential equipment investment get made — a full system replacement carries a $9,800–$22,000 price tag, sets the home’s heating and cooling capacity for the next 15–20 years, locks in efficiency ratings that drive ongoing operating cost, and determines comfort outcomes (temperature stability, humidity control, airflow distribution) that residents experience daily. The single most important variable in installation outcome is correct equipment sizing through ACCA Manual J load calculation at the 3°F ASHRAE winter design temperature and 94°F/76°F summer design conditions specific to Kirkwood — oversized equipment short-cycles and underdehumidifies; undersized equipment runs continuously and can’t maintain setpoint during peak conditions. This page surveys the six installation service categories Purisync operates, with links to specific service detail pages for each.

The Six Installation Service Categories

HVAC Replacement

Complete system replacement covering matched AC + furnace, AC-only replacement (where furnace is recent and still has substantial service life), or furnace-only replacement (where AC is recent). Manual J load calculation, Manual S equipment selection, Manual D ductwork verification, AHRI coil matching, R-454B refrigerant transition handling, permit pull through applicable municipal authority, and post-installation verification with Yellow Jacket TitanHV refrigerant pressure and Testo 510i static pressure measurement. HVAC replacement details →

Ductless Mini-Splits

Ductless heat pump installation for historic district homes without existing forced-air ductwork (Meramec Highlands 1890s, Central Place 1920s, Jefferson-Argonne 1850s–1950s), additions and conversions without HVAC, and single-zone applications. Mitsubishi Hyper-Heat M-Series, Daikin Aurora, and Fujitsu Halcyon platforms. Single-zone, multi-zone, and ducted-plus-ductless hybrid configurations. Ductless mini-split details →

Zoned HVAC Systems

Multi-zone forced-air systems with motorized dampers and zone controls for homes with comfort variation across living areas. Larger Town and Country homes, multi-floor configurations with significant temperature variation, additions integrated with original ductwork, and homes with specific room-by-room comfort requirements all benefit from zoning. Honeywell TrueZone, EWC Controls, and Carrier Infinity zoning platforms. Zoned HVAC details →

Smart Thermostats

WiFi-connected thermostats with learning, scheduling, geofencing, and integration features. Ecobee SmartThermostat Premium, Nest Learning Thermostat (3rd and 4th gen), Honeywell T10 Pro, and Aprilaire 8920W communicating thermostats. Equipment compatibility verification, C-wire installation when needed, app setup, and integration with smart-home platforms (Apple HomeKit, Google Home, Amazon Alexa). Smart thermostat details →

Thermostat Repair

Repair and replacement service for failed thermostats — failed display, failed call relays, dead battery contacts, dead WiFi connectivity, miscalibrated temperature sensors. Common universal replacement thermostats carried for same-visit repair. Thermostat repair details →

Air Handler Services

Air handler installation, replacement, and service. Cased and uncased coil installation, blower wheel and motor replacement, evaporator coil replacement (separate from refrigerant work covered under evaporator coil service), supply plenum and return plenum modifications. ECM variable-speed blower upgrades on equipment still using PSC fixed-speed motors. Air handler service details →

The Manual J / Manual S / Manual D Methodology

ACCA (Air Conditioning Contractors of America) Manual J/S/D is the industry standard methodology for residential HVAC system sizing. Every Purisync installation quote includes:

Manual J Load Calculation

Whole-house heat loss and heat gain calculation at design conditions:

• Winter design temperature: 3°F (ASHRAE 99% St. Louis Lambert)
• Summer design temperature: 94°F dry bulb / 76°F coincident wet bulb (ASHRAE 1% St. Louis Lambert)
• Component analysis: walls, ceilings, floors, windows, doors with R-value and area inputs
• Infiltration assessment: estimated air changes per hour based on construction type and tightness
• Internal load: occupancy, lighting, appliances
• Solar gain: window orientation, shading, glazing type
• Output: BTU/hr heating load and BTU/hr cooling load (sensible plus latent)

Typical Manual J findings on Kirkwood homes:

• 1,500 sf 1950s ranch: 40,000–55,000 BTU/hr heating, 24,000–30,000 BTU/hr cooling (2–2.5 tons AC)
• 2,400 sf 1990s two-story: 50,000–70,000 BTU/hr heating, 30,000–42,000 BTU/hr cooling (2.5–3.5 tons AC)
• 3,600 sf 2015 build with good insulation: 55,000–75,000 BTU/hr heating, 36,000–48,000 BTU/hr cooling (3–4 tons AC)
• 4,500 sf Town and Country with cathedral ceilings and large windows: 80,000–110,000 BTU/hr heating, 48,000–60,000 BTU/hr cooling (4–5 tons AC)

Manual S Equipment Selection

Equipment selected from manufacturer AHRI-certified ratings to match Manual J output:

• Heating capacity matching: furnace output BTU/hr or heat pump capacity at design temperature
• Cooling capacity matching: AC nominal tonnage with sensible and latent split appropriate for Climate Zone 4A mixed-humid load
• Coil matching: AHRI-listed coil matched to outdoor condenser for rated efficiency
• Blower selection: appropriate CFM and static pressure capability for ductwork configuration

Manual D Ductwork Verification

Existing ductwork capacity assessment compared to new equipment requirements:

• Trunk and branch sizing: appropriate cross-sectional area for required CFM
• Static pressure budget: verifying existing ductwork can deliver required airflow within blower static pressure rating
• Register distribution: room-by-room CFM verification compared to Manual J zone loads
• Modification recommendations: where existing ductwork is undersized or poorly configured, modifications quoted separately

R-454B Refrigerant Transition

The HVAC industry transition from R-410A to R-454B refrigerant under the AIM Act took effect January 1, 2025. All new AC and heat pump installations since that date use R-454B. Specific implications for Kirkwood installations:

• R-454B has GWP (Global Warming Potential) under 700, versus R-410A at GWP 2,088 — substantial environmental improvement
• R-454B is mildly flammable (A2L classification), requiring specific equipment design, leak detection, and installation practices. Modern AHRI-listed equipment is engineered for safe R-454B operation; older equipment is not field-convertible.
• R-454B equipment is not retrofit-compatible with R-410A. Replacing one component of a system (e.g., outdoor condenser) requires evaluating whether the matched indoor coil is compatible with the new refrigerant.
• Installation practices and tools: Purisync technicians are EPA Section 608 certified and equipped with R-454B-compatible recovery tools, leak detectors, and brazing techniques.

Permitting Across the Six-City Service Area

Installation permits are pulled through the applicable municipal authority:

• Kirkwood Public Works: (314) 822-5800
• St. Louis County Department of Public Works (Affton and Sappington unincorporated areas): (314) 615-8530
• Webster Groves Public Works: (314) 963-5300
• Crestwood Public Works: (314) 729-4790
• Town and Country Public Works: (314) 432-6606

Permit fees vary by jurisdiction and equipment, typically $80–$340 for residential HVAC equipment installation. Purisync handles permit pull as part of installation scope — customers don’t deal with the municipal authority directly. Final inspection scheduled after installation completes.

Pricing Summary

• Furnace-only replacement: $4,800–$7,800 installed (80–96% AFUE, single-stage to variable-speed)
• AC-only replacement: $5,600–$11,200 installed (14–20 SEER2, single-stage to variable-speed)
• Matched AC + furnace replacement: $9,800–$18,500 installed
• Single-zone ductless heat pump: $4,400–$7,800 installed
• Multi-zone ductless heat pump (2–5 zones): $8,200–$18,500 installed
• Ducted whole-home cold-climate heat pump: $9,800–$16,800 installed
• Zoning system retrofit (existing ductwork): $1,800–$4,800 depending on zone count
• Smart thermostat installation: $340–$680 including equipment and C-wire installation if needed
• Thermostat repair or non-smart replacement: $189–$340
• Air handler service (component replacement): $480–$1,800 depending on scope; full air handler replacement $2,800–$4,800
• ECM blower motor upgrade (PSC to ECM retrofit): $540–$980

All pricing includes Manual J/S/D analysis, equipment, installation labor, permit pull, post-installation verification, manufacturer warranty registration, and Purisync 2-year labor warranty. Tax credits and utility rebates (Ameren Missouri heat pump rebates, IRA Section 25C federal credits) reduce out-of-pocket cost on qualifying equipment.

Frequently Asked Questions

How much does HVAC installation cost in Kirkwood?

Pricing varies substantially by scope and equipment. Furnace-only replacement runs $4,800-$7,800 installed depending on AFUE rating and equipment tier. AC-only replacement runs $5,600-$11,200 installed (14-20 SEER2, single-stage to variable-speed). Matched AC + furnace replacement runs $9,800-$18,500 installed. Single-zone ductless heat pump runs $4,400-$7,800. Multi-zone ductless heat pump runs $8,200-$18,500. Ducted whole-home cold-climate heat pump runs $9,800-$16,800. Zoning system retrofit on existing ductwork runs $1,800-$4,800. Smart thermostat installation runs $340-$680. All pricing includes Manual J/S/D analysis, equipment, installation labor, permit pull, post-installation verification, manufacturer warranty registration, and Purisync 2-year labor warranty. Tax credits and utility rebates reduce out-of-pocket cost on qualifying equipment.

How is equipment sized for my Kirkwood home?

ACCA Manual J load calculation at design conditions: 3°F winter (ASHRAE 99% St. Louis Lambert) and 94°F dry bulb / 76°F coincident wet bulb summer (ASHRAE 1%). Calculation accounts for component R-values (walls, ceilings, floors, windows, doors), infiltration estimate based on construction tightness, internal load (occupancy, lighting, appliances), and solar gain (window orientation, shading, glazing). Output is BTU/hr heating load and BTU/hr cooling load with sensible and latent split. Typical findings: 1,500 sf 1950s ranch needs 2-2.5 tons AC; 2,400 sf 1990s two-story needs 2.5-3.5 tons; 3,600 sf 2015 build needs 3-4 tons; 4,500 sf Town and Country home with cathedral ceilings needs 4-5 tons. Manual S equipment selection matches AHRI-rated capacity to Manual J output; Manual D verifies existing ductwork can deliver required airflow.

What’s R-454B and how does it affect my installation?

R-454B is the refrigerant that replaced R-410A in all new residential HVAC installations under the AIM Act effective January 1, 2025. Benefits: GWP (Global Warming Potential) under 700 versus R-410A at GWP 2,088 — substantial environmental improvement. Considerations: R-454B is mildly flammable (A2L classification), requiring specific equipment design, leak detection, and installation practices; modern AHRI-listed equipment is engineered for safe R-454B operation, while older equipment is not field-convertible; R-454B equipment is not retrofit-compatible with R-410A, so replacing one component of an existing R-410A system requires evaluating whether the matched indoor coil is compatible with the new refrigerant. Purisync technicians are EPA Section 608 certified and equipped with R-454B-compatible recovery tools, leak detectors, and brazing techniques. Practical effect on customers: new installations since January 2025 use R-454B with manufacturer warranty active under new refrigerant; existing R-410A equipment continues operating normally with R-410A service available through 2030+.

Do I need a permit for HVAC installation?

Yes, in all six cities in our service area. Permits are pulled through the applicable municipal authority: Kirkwood Public Works at (314) 822-5800, St. Louis County DPW at (314) 615-8530 for Affton and Sappington, Webster Groves PW at (314) 963-5300, Crestwood PW at (314) 729-4790, or Town and Country PW at (314) 432-6606. Permit fees vary by jurisdiction and equipment, typically $80-$340 for residential HVAC equipment installation. Purisync handles permit pull as part of installation scope — customers don’t deal with the municipal authority directly. Final inspection by the municipal inspector verifies equipment installation, refrigerant connections, electrical work, venting (for combustion equipment), and condensate handling. Inspector signature closes the permit. Installations without permits create code violations that affect resale and insurance coverage.

How long does HVAC installation take?

Furnace-only replacement: typically 1 day. AC-only replacement: typically 1 day. Matched AC + furnace replacement: typically 1-2 days. Single-zone ductless heat pump: typically 1 day. Multi-zone ductless heat pump (2-5 zones): typically 1.5-3 days depending on zone count and routing complexity. Ducted whole-home cold-climate heat pump: typically 1.5-2 days. Zoning system retrofit on existing ductwork: 0.5-1.5 days. Smart thermostat installation: 1-2 hours. Air handler component service: 0.5-1 day depending on scope. Permit pull is typically same-day in our six-city service area. Equipment delivery typically takes 3-10 business days from contract signing, which becomes the constraint on overall installation timeline. We schedule installation visits Monday-Saturday with flexible morning or afternoon arrival windows.

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Contact Purisync Heating and Air

For HVAC installation quotes, Manual J load calculation consultation, or equipment recommendations across the six installation service categories, contact our 325 N Kirkwood Road office at (314) 338-5111. Quote consultations include site walk-through, equipment recommendations across multiple brands and tiers, written quote with itemized pricing, and Manual J calculation summary so customers can verify sizing methodology.

• 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

Contact Us →

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)