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Your Trusted HVAC Partner in Lititz, PA
Established in Lititz, Pennsylvania, Mark Overly HVAC has built a reputation for delivering precise and reliable heating, ventilation, and air conditioning solutions. Our team combines decades of hands-on experience with factory-certified expertise through partnerships with leading brands like American Standard, Rheem, and Mitsubishi. We specialize in energy-efficient HVAC installations, geothermal systems, and air quality optimization, ensuring homes and businesses achieve optimal comfort. Our technicians hold industry-recognized certifications, including NATE, IGSHPA, and NCI, reflecting our commitment to technical excellence.

We prioritize customer collaboration, tailoring solutions to individual needs while maintaining rigorous standards of workmanship. Our focus on air flow measurement, combustion safety, and system performance guarantees long-term efficiency and client satisfaction. Backed by partnerships with Burnham and Fujitsu, we deliver cutting-edge technology and proven methodologies to every project. Our team's dedication to continuous training ensures we remain at the forefront of HVAC innovation, providing clients with reliable, future-ready solutions.
Services
HVAC Maintenance New Installation Geothermal Systems Radiant Heating Ventilation Services
Highlights and features
  • We implement patented air balancing techniques for optimal HVAC performance.
  • Our team holds multiple factory certifications from leading HVAC manufacturers.
  • We guarantee system performance ratings through NCI-certified diagnostics.
  • Our technicians complete annual combustion safety training programs.
  • We offer geothermal system designs for commercial and residential applications.
Associations and certifications
  • IGSHPA
  • NATE
  • NSI
  • NBI
  • NCI
Services
HVAC Maintenance
Our preventive maintenance ensures HVAC systems operate at peak efficiency year-round. Technicians perform comprehensive inspections, filter replacements, and component adjustments to prevent breakdowns. Regular servicing extends equipment lifespan while maintaining manufacturer warranties.
Geothermal Systems
We design and install commercial geothermal heating/cooling systems that leverage stable underground temperatures. These systems reduce energy consumption by up to 60% compared to traditional HVAC while providing consistent climate control for large buildings.
Air Quality Testing
Our combustion analysis and air flow measurements identify indoor air quality issues. Using specialized tools, we detect carbon monoxide leaks, ventilation deficiencies, and airflow imbalances to create healthier living environments.
Smart Thermostats
We integrate advanced thermostat systems from Honeywell, Ecobee, and Nest for precise temperature management. These smart devices optimize energy usage through learning algorithms and remote access capabilities.
Radiant Floor Heating
Our radiant heating solutions deliver even warmth through hydronic tubing installed beneath flooring surfaces. This energy-efficient system eliminates cold spots while maintaining consistent indoor temperatures without forced air circulation.
People
Mark Overly
Owner
With over 20 years in HVAC, Mark holds multiple certifications including IGSHPA Accredited Installer and NCI Performance Rater. He leads system design and troubleshooting while maintaining factory training partnerships.
Dustin Schlenbaker
Owner, Tempro HVAC
Master HVAC installer specializing in high-efficiency system installations. Dustin brings advanced technical expertise through IGHSPA certification and hands-on experience with complex HVAC projects.
Cody Dombach
Controls Specialist
Electrical expert focusing on HVAC control systems and high-voltage installations. Cody ensures seamless integration of smart thermostats and automation systems with existing HVAC infrastructure.
Randall Reedy
Electrical Technician
Specializes in electrical systems for HVAC applications. Randall handles complex wiring and control circuits, maintaining safety standards for both residential and commercial installations.
Questions
What HVAC services do you offer?
We provide complete HVAC solutions including installations, maintenance, geothermal systems, radiant heating, and air quality testing for residential and commercial properties.
Do you service commercial buildings?
Yes, we design and install geothermal systems for commercial applications, specializing in energy-efficient solutions for large-scale HVAC requirements.
What certifications do your technicians hold?
Our team maintains certifications from IGSHPA, NATE, NSI, NBI, and NCI, ensuring expertise in combustion analysis, air balancing, and system performance rating.
How do you handle carbon monoxide safety?
We conduct combustion analysis to detect CO leaks, verify proper venting, and recommend low-level CO monitors. Our technicians follow strict safety protocols during all HVAC servicing.
Can you install smart thermostat systems?
Yes, we integrate Honeywell, Ecobee, and Nest thermostats for optimized temperature control and energy savings through automated scheduling and remote access.
Do you offer geothermal system maintenance?
We provide comprehensive geothermal system maintenance including loop field inspections, heat pump diagnostics, and efficiency optimization services for existing installations.