A 5,000 ppm analyzer display during furnace-exhaust testing: why context matters
Cooley Mechanical · Furnace field notes A 5,000 ppm analyzer display during furnace-exhaust testing: why context matters A Saint Clair Shores furnace visit raises an important question: what could be behind an exhaust-test warning? Finding reported October 20, 2026 · Saint Clair Shores, Michigan The furnace had been installed in 2018. During our furnace-exhaust testing […]
Michigan Fall Home Maintenance Checklist
Cooley Mechanical · Home care Michigan Fall Home Maintenance Checklist Disconnect the hose. Bring out clean, dry bedding. Remember the bathroom nobody uses. A useful fall routine reaches beyond the furnace—and starts with the things that are easy to overlook. Before Michigan settles into freezing nights and more time indoors, take a walk around the […]
Factory-Built Wood-Burning Fireplace Chimney Installation: What’s Inside the Chase?
Factory-Built Wood-Burning Fireplace Chimney Installation: What’s Inside the Chase? The finished fireplace gets the attention. The hidden chimney deserves just as much. Behind that finished chase is more than a run of metal pipe. There is a specified chimney system, space that must remain clear, support and penetration details, weather protection, and a termination selected […]
Rooftop Unit Repair or Replacement? Start with Ventilation
Cooley Mechanical · Commercial HVAC guide Rooftop Unit Repair or Replacement? Start with Ventilation An older commercial rooftop unit does not need replacement solely because of its age. The useful question is whether the existing RTU can safely and reliably perform the heating, cooling, airflow, and ventilation functions the building now needs—and whether the repair […]
Economizer Inspection, Testing & Repair: What to Expect
Cooley Mechanical · Commercial HVAC guide Economizer Inspection, Testing & Repair: What to Expect An economizer inspection should answer a practical question: can the rooftop unit’s outside-air components move through the intended sequence, and what prevents them from doing so when they cannot? The answer may involve a damper, actuator, linkage, sensor, control, wiring, intake […]
How Much Fresh Air Does a Commercial Building Need?
Cooley Mechanical · Commercial HVAC guide How Much Fresh Air Does a Commercial Building Need? There is no single fresh-air number for every commercial building. The outdoor airflow depends on the use of each space, its occupiable floor area, expected population, the applicable people and area rates, air-distribution effectiveness, and the type of ventilation system […]
What Does an Economizer Do on a Rooftop Unit?
Cooley Mechanical · Commercial HVAC guide What Does an Economizer Do on a Rooftop Unit? An air-side economizer lets a commercial rooftop unit use suitable outdoor air for cooling. Its controls coordinate outside-air and return-air dampers, normally opening the outdoor-air path farther when conditions can reduce the amount of compressor cooling needed. Honeywell’s economizer overview […]
Commercial HVAC Requirements Before Building Occupancy
Cooley Mechanical · Commercial HVAC guide Commercial HVAC Requirements Before Building Occupancy If an inspector says the economizer or fresh-air system must work before a business can occupy a building, treat that as a specific ventilation and project-closeout problem—not simply an air-conditioning repair. The fastest useful response is to get the correction in writing, identify […]
HVAC Warranties Explained: Parts, Labor & Unit Replacement Coverage
HVAC Warranties Explained: Parts, Labor & Unit Replacement Coverage A good HVAC warranty helps Michigan homeowners understand what protection may be available if a furnace, air conditioner, or full comfort system has a covered issue. The details can vary by brand, model, installation, registration, and documentation, so this HVAC warranty guide for Michigan homeowners: parts […]
AirEase HVAC Guide for Southeast Michigan Homes
AirEase HVAC Guide for Southeast Michigan Homes Comparing AirEase equipment for a home in Washington Township or Southeast Michigan starts with the home: how much heating and cooling it needs, how air moves through the rooms, and which parts of the existing system can remain. A model number or efficiency rating cannot answer all of […]