Heat Pump Maintenance in Dundee, Michigan

Here is what the fall heat pump visit looks like at a Dundee home: the defrost board and sensor get tested and we watch a real defrost cycle, the reversing valve gets shifted both ways, the charge gets checked against the heating chart, the backup strips or the furnace get verified, and on a dual-fuel system the balance point on the thermostat gets set where the equipment and current DTE Energy rates say it belongs. Then we walk outside and check that the unit near Dundee Mountain for skiing just outside town is sitting high enough on its stand to drain and not get buried. That is the Temprasure visit across Dundee, MI.

Dundee houses and what that means for heat pump maintenance

Dundee's housing has two distinct halves. The village core along Riley, Tecumseh and Monroe Streets is 1860s to 1930s frame and brick houses on Michigan basements or stone foundations, with retrofitted ductwork and, in a few cases, a boiler still in service. These houses have furnaces in low, damp basements near the river, water heaters that have been through a flood or two, and central air added in the 90s with a condenser on the side of the house. The post-2000 subdivisions along Ann Arbor Road and on the west side of US-23 are colonials and ranches on poured basements with builder-grade 80 percent furnaces and 13 SEER condensers that are now 15 to 25 years old and starting to fail. Outside the village limits, farmhouses and acreage homes on propane are common. Water in the village is municipal, but township addresses are on wells, and the well water in this part of Monroe County is hard enough to be a real factor in water heater and humidifier life.

Winter drainage is the physical maintenance item for Dundee heat pumps. Every defrost cycle sends water off the outdoor coil, and in a Monroe County January that water freezes under and around the unit. A heat pump on a pad at grade near Dundee Mountain for skiing just outside town ends up frozen into a sheet of ice by February, with the coil's bottom rows blocked and the fan working against it. On the fall visit we check the riser stand height, the drainage path and the clearance around the unit, and where the original installer set it directly on a pad we recommend a stand. In spring we check whether the ice did any damage to the fan, the coil fins or the base pan.

In Dundee the furnace is the one appliance nobody thinks about until it fails at 11 p.m. with the temperature falling through the teens. That is when the phone rings, and that is when being 22 miles away matters. We know the 1860s–1930s village houses with 1990s–2010s subdivisions on the edges along the US-23 and M-50 interchange and the basements near the Old Mill Museum on the River Raisin, we carry parts for every brand that went into Monroe County homes, and we charge the same flat rate at midnight that we charge at noon. Dundee has about 4,000 in the village, with the township adding a few thousand more people and a lot of twenty-year-old furnaces; we would rather tell you yours has five winters left than sell you a new one it does not need.

Local details we plan around in Dundee

• Well water on the township side is hard, so water heater sediment flushing and humidifier pad replacement come up more often than in the Detroit-system suburbs.
• Dundee is the far end of our radius, so we group calls there and in Milan on the same run, but emergency service still goes out the same day.
• The 2000s subdivisions were built with flex-duct branch runs that sag and restrict airflow, which is the usual cause of weak upstairs airflow here.
• Dundee is flat, open Monroe County farmland with the River Raisin running through the middle of the village, and the millpond and river bottoms keep the downtown blocks humid and fog-prone in spring and fall. The open fields around the village let winter wind run unchecked, and Dundee is close enough to Lake Erie to pick up more cloud cover and occasional lake-enhanced snow than Ypsilanti sees. Summer afternoons are humid with dew points regularly near 70.