How cold does it get in Indianapolis in winter?
Cold enough that winter is the main planning concern for portable units here. The figures below come from the National Weather Service and describe normal conditions, not a forecast for any particular week.
The average January low is 20.9 F and the average January high is 36.1 F. Across the normal winter from December through February the high stays at or below 32 F on about 27 days, which is a freezing high on roughly a third of the winter. The low reaches 0 F or colder on about 3 days.
Snow adds a second problem. Normal January snowfall is 8.8 inches, and the normal winter brings about 21.2 inches. Snow does not simply sit on a site. It shifts into drifts against walls and fences, and a unit can end up in a low pocket that stays wet and icy after each thaw. Plan for the snow that is on the ground in February, not only the snow that fell in December.
Why does a winter unit get antifreeze in the tank?
Antifreeze keeps the liquid in the holding tank from locking up between services. It does not replace a service visit.
The tank holds liquid and solids, and the liquid is what freezes first in cold weather. When the tank is topped up with antifreeze at each visit, the liquid is less likely to lock up, which keeps the unit usable and makes the next pump-out easier. The product and the amount are chosen by the technician for the unit, and the way it is added depends on how the unit is set up and how cold the site is likely to get.
How often does a winter unit get serviced?
More often than a warm-weather unit on the same lot, because frozen waste is harder to pump and frost can build up on the door seal.
Service intervals are set by how many people use the unit and how cold the site runs. In warm weather a unit with light use can go longer between visits. In winter the same unit may need a visit sooner, because waste that has partly frozen in the tank is slower to pump and can leave the unit hard to use until the next visit.
Where should a winter unit sit?
Out of the wind, on firm ground, and where a service truck can still reach it after a snowfall.
A unit in a sunny spot and sheltered from the wind stays warmer and dries faster than one set out in an open field. The sun helps and the wind does not. A spot sheltered by a building wall or a fence is a common choice because it cuts the wind on the door. The placement should not block a path people use after dark, and it should not sit where melting snow runs under the base and freezes.
What moves the price up or down in winter?
Size, access, how often the unit is serviced, and how long it stays on site. The price is explained and approved before work starts.
Winter adds cost where it adds work. A unit that needs antifreeze and an extra visit costs more to keep usable than the same unit in May. A longer rental term means more service visits across the cold months. Access matters too: a site where the truck has to cross unplowed ground or wait for a drive to be cleared takes more time than one with a clear approach.
The unit type changes the quote as well. A standard unit in a sheltered yard is the simplest case. An accessible unit, an insulated or heated unit, or a trailer for a very cold site each adds equipment, placement and service that the local provider has to plan for. The local provider quotes the job once the site, the term and the service schedule are known, and the price is explained and approved before work starts.