Combined HVAC Tune-Up in Kirkwood and West St. Louis County

Most Kirkwood homes have both central AC and a gas furnace — two pieces of equipment with different optimal service windows (spring for AC, fall for furnace) that get scheduled as separate visits in most service operations. The combined HVAC tune-up consolidates both pieces of equipment into a single visit, typically late September, providing complete annual maintenance for $219 instead of $258 for the two separate $129 visits. The $39 savings reflects the efficiency of a single dispatch instead of two; the comprehensive scope is identical to what’s covered in separate spring and fall visits. This page documents the full combined tune-up protocol, when separate spring/fall visits make more sense, and the multi-system pricing for homes with 2+ AC or 2+ furnaces.

Combined Visit Scope — AC and Furnace Together

Air Conditioning System (Standard Spring AC Tune-Up Scope)

1. Pre-service operation baseline — system started, cooling cycle verified, baseline measurements taken
2. Yellow Jacket TitanHV refrigerant pressure verification — suction and liquid line pressures, calculated subcooling (TXV systems, target 7–10°F) or superheat (piston systems, target 8–15°F)
3. Refrigerant charge by weight verification compared to equipment nameplate
4. Capacitor microfarad measurement with Fluke 902 FC clamp meter — dual-run capacitor compressor and fan sections, comparison to rated values within 5% tolerance
5. Contactor visual inspection for pitting, welded contacts, burn marks
6. Compressor amperage verification compared to nameplate RLA
7. Condenser coil cleaning — gentle pressure wash with appropriate coil cleaner
8. Condenser fan motor verification — amperage, bearing condition, blade balance
9. Evaporator coil visual inspection through access panel
10. Drain pan and condensate line cleaning — biocidal treatment, condensate line shop-vac clear
11. Supply and return temperature differential — target 18–22°F across the coil
12. Static pressure measurement — Testo 510i across the air handler
13. Air filter replacement — standard 1" MERV 8 included
14. Thermostat verification — calibrated reference comparison, battery replacement if needed

Furnace System (Standard Fall Furnace Tune-Up Scope)

1. Pre-service operation baseline — heating cycle verified, baseline measurements taken
2. Bacharach Fyrite Insight Plus combustion analysis — CO air-free under 100 ppm target, CO2 8–11%, O2 4–9%, stack temperature, calculated efficiency
3. Testo 510i gas pressure verification — Spire Missouri 7" WC nominal at meter, 3.5" WC at manifold post-regulator for single-stage natural gas
4. Hawkeye inspection borescope heat exchanger inspection — visible cracks, carbon scoring, condensate damage, structural integrity. Photos documented on work order.
5. Ignition sequence verification — thermostat call, inducer motor start, hot surface igniter glow, gas valve opening, burner ignition within 3–7 seconds, flame sensor proof, blower delay timer expiration
6. Hot surface igniter inspection — visual condition, resistance measurement (typical 11–200 ohms depending on equipment)
7. Flame sensor inspection and cleaning — oxidation removal with fine steel wool, microamps measurement during burner operation (target 1–6 microamps)
8. Pressure switch verification — switch closure during inducer startup
9. Limit switch operation — high-limit switch continuity and reset
10. Inducer motor service — amperage, bearing condition
11. Blower motor and wheel inspection — amperage at all speeds, balance, debris
12. Venting inspection — B-vent/chimney connector for 80% AFUE, PVC slope and termination for 92%+ AFUE
13. Combustion air supply verification — adequate makeup air for tight construction

When Combined Tune-Up Makes Sense

• Stable equipment with no current concerns. Equipment without recent failures or specific issues benefits from the consolidated visit timing and cost savings.
• Homeowners with limited scheduling flexibility. Single annual visit instead of two separate visits reduces total scheduling burden.
• Late September timing works well: cooling season has just ended (AC at peak post-summer load assessment opportunity) and heating season hasn’t started (furnace preventive service before first cold snap).
• Equipment 0–10 years old. Newer equipment with manufacturer warranty active is in low-failure-rate years where one annual visit catches developing issues adequately.

When Separate Spring + Fall Visits Make Sense

• Equipment 10+ years old. Older equipment has higher failure rates and benefits from twice-annual service to catch developing issues before in-season failure.
• Equipment with recent repair history. Equipment that’s had failures in the past 1–2 years benefits from closer monitoring with twice-annual visits.
• Households with vulnerable occupants. Homes with elderly residents, infants, or health-sensitive occupants benefit from twice-annual reliability verification.
• Specific concerns identified during installation or previous tune-ups. Equipment with documented borderline issues (capacitor near low tolerance, marginal heat exchanger condition, etc.) benefits from twice-annual reassessment.
• Spring-specific AC concerns or fall-specific furnace concerns. Households with prior history of summer AC failures or winter furnace failures benefit from season-specific visits.

Multi-System Pricing

Homes with multiple HVAC systems (common in larger Town and Country homes, multi-floor configurations, or homes with separate zoning for additions) pay reduced per-unit pricing when units are serviced during the same visit:

• Primary AC + furnace combined tune-up: $219 (covering one matched system)
• Each additional AC or furnace unit: $99 per unit when serviced during the primary visit
• Multi-zone ductless heat pump: pricing varies by zone count; typically $159 first zone, $79 each additional zone

Pricing

• Combined AC + furnace tune-up (one matched system): $219. Saves $39 vs. separate $129 visits.
• Single AC tune-up (spring, no furnace): $129
• Single furnace tune-up (fall, no AC): $129
• Combined visit with additional unit: $219 + $99 per additional unit
• Combined visit with humidifier annual service: $219 + $129 (humidifier service)
• Combined visit with UV-C lamp replacement: $219 + $140–$280 (lamp cost)
• Maintenance plan members: tune-ups included in plan pricing at no additional charge

All pricing includes labor, standard 1" MERV 8 filter, instrument time, condensate cleaning, work order documentation, and Purisync 2-year labor warranty on any repair work performed during the visit. Parts replacement (hot surface igniters, capacitors, etc.) is additional and quoted before installation if customer authorizes.

Frequently Asked Questions

What’s included in a combined HVAC tune-up?

Complete spring AC tune-up and fall furnace tune-up scope in a single late-September visit. AC scope includes Yellow Jacket TitanHV refrigerant verification with calculated subcooling, capacitor microfarad measurement, contactor inspection, compressor amperage verification, condenser coil cleaning, drain pan cleaning, supply/return temperature differential measurement, static pressure verification, and filter replacement. Furnace scope includes Bacharach Fyrite Insight Plus combustion analysis with under-100 ppm CO air-free target, Testo 510i gas pressure verification, Hawkeye inspection borescope heat exchanger inspection, ignition sequence verification, hot surface igniter and flame sensor service, pressure switch and limit switch verification, inducer and blower motor service, and venting inspection. Total visit time typically 2-3 hours.

How much does a combined HVAC tune-up cost?

$219 for combined AC + furnace tune-up on one matched system, saving $39 vs. two separate $129 visits. Multi-system homes add $99 per additional unit when serviced during the primary visit. Humidifier annual service combined with the tune-up visit adds $129. UV-C lamp replacement combined adds $140-$280 (lamp cost). Maintenance plan members receive combined tune-up at no additional charge as part of plan membership benefit. All pricing includes labor, standard 1-inch MERV 8 filter, instrument time, condensate cleaning, work order documentation, and Purisync 2-year labor warranty on any repair work performed during the visit. Parts replacement is quoted before installation if customer authorizes.

When should I schedule the combined tune-up?

Late September is the optimal scheduling window. This timing catches the AC at the end of cooling season (peak load assessment opportunity to identify any developing issues from the just-completed summer) and the furnace before heating season begins (preventive service before first cold snap brings equipment into continuous operation). Earlier scheduling (August) is fine if convenient. Later scheduling (October) is also acceptable but increasingly compressed against heating season demand. By mid-November, emergency no-heat scheduling pressure compresses our dispatch calendar and preventive tune-up scheduling becomes more difficult. Book in September if possible for best scheduling flexibility.

Should I do combined tune-up or separate spring and fall visits?

Combined makes sense for stable equipment 0-10 years old with no recent failures, households with limited scheduling flexibility preferring single annual visit, and homes without specific concerns warranting twice-annual reassessment. Separate spring and fall visits make sense for equipment 10+ years old (higher failure rates benefit from twice-annual service), equipment with recent repair history requiring closer monitoring, households with vulnerable occupants where twice-annual reliability verification has high value, and equipment with documented borderline issues warranting reassessment. We recommend the approach that fits your specific situation rather than defaulting to one approach for all customers.

What if the tune-up finds a problem?

Findings are documented with measurements and photos on the work order. For findings that compromise safety (cracked heat exchanger producing CO, gas leak, etc.), the equipment is shut down pending repair and the customer receives explicit written notice. For findings that compromise immediate operation (failed component preventing system function), same-visit repair is offered if parts are available and customer authorizes. For non-safety findings (marginal component approaching end of life, filter upgrade opportunity, etc.), the tune-up itself completes and a written quote for additional work is provided for separate scheduling. Parts replacement during the tune-up visit is at the customer’s option after written quote review — no surprise charges added without authorization. Repair work performed during the visit carries Purisync 2-year labor warranty.

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Contact Purisync Heating and Air

To schedule a combined HVAC tune-up or discuss whether combined or separate visits fit your equipment best, contact our 325 N Kirkwood Road office at (314) 338-5111. September scheduling is the priority window — book early to lock in your preferred date.

• 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

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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)