Pressure Washing vs Power Washing: What Does a Savannah Home Need?

Pressure washing and power washing describe almost the same thing: the only genuine technical difference is that a power washer heats the water and a pressure washer does not. On a Savannah home, though, neither high-pressure method is usually the right answer. Painted siding, stucco, tabby, and shingle roofs here are cleaned with soft washing - low pressure plus a cleaning solution that kills the mildew rather than blasting it off. Heat and high pressure belong on hard flat surfaces: concrete, pavers, and commercial areas with grease or gum.

What is the actual difference between pressure washing and power washing?

Heat. A power washer runs the water through a heating element, typically to somewhere around 150 to 200 degrees; a pressure washer sprays it cold. Both push water at similar pressure, and both use the same nozzles, hoses, and surface cleaners. Most companies in the Savannah market - including us - own equipment that does both, which is why you will see the two words used interchangeably in ads. If a contractor tells you power washing is a fundamentally different and more expensive service for washing your house, be skeptical.

Which one does a Savannah home actually need?

For siding, roofs, and painted surfaces: neither, at full pressure. Our climate grows algae, Gloeocapsa roof streaking, and mildew because salt air off the river, near-constant humidity, and live-oak shade keep walls damp. Those are living organisms, and pressure only knocks the surface layer off - it grows back within months. A soft wash applies a cleaning solution that kills the growth at the root, then rinses at garden-hose pressure. That is why our house washing in Savannah is soft-wash based rather than high pressure, and why the results last a season or more instead of weeks.

When is heat worth paying for here?

Three situations, all of them flat hard surfaces. Oil and transmission stains on a concrete driveway lift far better with hot water than cold. Chewing gum and grease on commercial walkways and around dumpster pads essentially require heat. And heavy tire marks or shaded, long-neglected concrete come cleaner in one pass with hot water instead of three cold ones. For a routine driveway or paver walk with oak pollen and algae, cold water plus a surface cleaner does the job at a lower price.

Can high pressure damage a Savannah house?

Yes, and the failures are expensive. Water driven behind vinyl or Hardie siding gets trapped in the wall cavity in humidity that never lets it dry, which is how mold problems start. High pressure on an asphalt shingle roof strips the granules that are the shingle's UV protection and can void the manufacturer warranty. On the older stucco, tabby, and soft brick common in and around the Historic District, pressure erodes mortar joints and the surface itself. None of that is reversible with more cleaning.

Does the choice change what it costs?

Only modestly. In Savannah, a typical single-story house wash runs roughly 250 to 450 dollars and a two-story roughly 400 to 700 dollars, whether the truck heats the water or not, because the price is driven by square footage, height, and access. Where heat does add cost is on stained concrete: expect to pay somewhat more for hot-water treatment of oil spots than for a standard driveway clean. Ask for the price of the finished result rather than the machine - send a few photos and get an upfront price and you can compare quotes on the same basis.

Frequently asked questions

Is soft washing just a weaker version of pressure washing? No. It is a different mechanism. Pressure removes dirt physically; soft washing applies a solution that kills algae and mildew biologically, then rinses. On organic Lowcountry growth the soft wash is the more thorough of the two, not the gentler compromise.

My contractor says they power wash houses. Is that a red flag? Not by itself - most people use the term loosely to mean exterior cleaning. Ask a direct follow-up instead: what pressure will you use on my siding, and will you apply a cleaning solution? If the answer involves high pressure on painted siding or a shingle roof, keep calling.

Can I rent a machine and do it myself? For a concrete driveway, reasonably yes, if you use a flat surface cleaner rather than a spinning wand, which leaves stripes. For siding and especially for a roof, the combination of ladder work in Savannah humidity and the real risk of forcing water behind the wall makes it a poor trade.