Humans have been chasing the same goal for thousands of years: get the house warm without setting it on fire. The story of how we did it — from open flames to today’s high-efficiency systems — is more entertaining than you’d think, and it explains a lot about the comfortable, efficient heating we install in Forney homes now. Pull up a warm chair.
Ancient warmth: fire, floors, and clever Romans
For most of human history, “heating” meant a fire in the middle of the room and a hole in the roof to let the smoke out. Effective at warming the people closest to it, less effective at warming everyone else — and a constant fire hazard.
The Romans were the show-offs of early heating. Their hypocaust system raised the floor on stacks of small pillars and ran hot air from a furnace through the gap and up through channels in the walls. The result was radiant warmth rising through the floor of a villa or bathhouse — essentially ancient radiant heat, two thousand years before it became a modern luxury. It took a slave-fed fire and a lot of fuel to run, but the comfort was remarkable for its time.
After the Roman world receded, much of that cleverness was lost for centuries. Most homes went back to the hearth and the fireplace — better than a fire pit, but still sending most of the heat straight up the chimney.
The stove age: wood, coal, and a lot of hauling
The real leap forward was the enclosed stove. By trapping the fire inside iron or steel, a stove radiated heat into the room instead of losing it up an open chimney. Benjamin Franklin famously tinkered with a more efficient stove design in the 1740s, and cast-iron stoves became the heart of the home through the 1800s.
As cities grew, coal took over from wood — it burned hotter and longer. Big homes and buildings used coal-fired systems in the basement that warmed water or air and distributed it through cast-iron radiators or floor grates. These old coal-and-radiator and boiler setups kept a lot of homes warm for generations. They were heavy, hungry for fuel, and meant someone shoveling coal and hauling ash on cold mornings. We mention them here purely as history — they’re not what anyone installs or what we service today — but they set the stage for the central heating we now take for granted.
Every comfort we expect now — even warmth in every room, no shoveling, no smoke — was a hard-won improvement over what came before. The forced-air gas and electric furnaces and heat pumps we install are the latest step in that long line.
The forced-air era and the efficiency race
The twentieth century changed everything. As natural gas and electricity reached neighborhoods, heating moved away from hauling solid fuel. The gravity furnace — a big fuel-burning unit that let warm air rise naturally through ducts — gave way to forced-air systems, where a blower pushes heated air through the home. Add a thermostat, and for the first time the house could regulate its own temperature without anyone tending a fire.
From there it became a race for efficiency. Engineers measured it with AFUE — Annual Fuel Utilization Efficiency, the share of fuel a furnace actually turns into household heat. Mid-century furnaces often landed in the 60 to 70 percent range, with the rest lost up the flue. Today’s high-efficiency gas furnaces reach the mid-90s, using sealed combustion, a secondary heat exchanger that squeezes extra warmth out of the exhaust, and variable-speed blowers that run quietly and steadily.
Then came a different idea entirely: the heat pump. Instead of making heat by burning fuel, a heat pump moves heat — pulling warmth from the outside air and bringing it indoors, then reversing in summer to cool. In a mild climate like ours, that’s remarkably efficient, and it’s why heat pumps have become so popular across North Texas.
What it all means for a Forney home today
All that history lands on a simple, comfortable reality. The systems we install and service in Forney homes are the efficient end of that long evolution: forced-air gas furnaces, electric furnaces, and heat pumps — including propane and dual-fuel setups that pair a heat pump with a gas furnace for the rare hard freeze. No coal, no shoveling, no smoke.
For a North Texas winter, where it’s mild most of the time with occasional sharp cold snaps, that mix is ideal. A heat pump handles the everyday efficiently; a furnace or the gas side of a dual-fuel system carries the load when the temperature really drops. If you’re weighing what makes sense for your home, our heating installation and replacement page lays out the options, and a seasonal tune-up keeps whatever you have running at its best.
Whether your furnace is brand new or you’re nursing an older unit through one more winter, we’re happy to take a look. Reach a real person at 469-728-7113. We offer same-day service, work in English and Spanish, hold Texas A/C License #51447, and serve Forney plus nearby Kaufman County towns like Mesquite, Terrell, Kaufman, Heartland, Rockwall, Heath, and Kemp.
Heating efficiency through the ages, at a glance
A playful tour of how homes stayed warm — and roughly how comfortable and efficient each era was compared to what we install today.
Those old coal, radiator, and boiler systems are history — not something we install or service. What we do today is forced-air gas and electric furnaces and heat pumps, sized and tuned for a North Texas home.
Furnace FAQs
What does AFUE mean on a furnace?
AFUE stands for Annual Fuel Utilization Efficiency — the percentage of fuel a furnace turns into actual heat for your home over a season. A 95% AFUE gas furnace converts 95 cents of every fuel dollar into heat, with the rest lost up the flue. Older furnaces often ran in the 60s or 70s, so modern high-efficiency models are a big jump. Higher AFUE generally means lower running costs.
Are furnaces really more efficient than they used to be?
By a wide margin. Mid-century furnaces commonly converted only around 60 to 70 percent of their fuel into usable heat. Today’s high-efficiency gas furnaces reach the mid-90s, thanks to sealed combustion, secondary heat exchangers, and variable-speed blowers. For a Forney home, that difference shows up directly on your winter bill.
Is a heat pump a kind of furnace?
Not exactly — and that’s what makes it interesting. A furnace creates heat by burning gas or running electric elements. A heat pump moves heat instead of making it, pulling warmth from the outside air even when it’s cold and bringing it inside. In our mild North Texas climate, heat pumps are very efficient, and we install and service them right alongside gas and electric furnaces.
Owner of Lexany’s Heating & AC. Family-owned in Forney since 2011 — most days he’s the one on the truck doing the work himself. Bilingual (English/Spanish).