Lennox SLP99V Furnace Benefits: Review, Features & Comparison

Summary

The Lennox SLP99V boasts an efficiency rating of up to 99% AFUE, converting nearly all fuel into usable heat.
Features such as a modulating gas valve and variable-speed blower provide precise temperature control and consistent airflow.
Homeowners report significant comfort improvements, including even heating, quieter operation, and noticeable energy savings on gas bills.
The SLP99V is ideal for larger homes in cold climates, families with children or allergies, and those seeking smart home integration.
Investing in the SLP99V can lead to energy savings that pay off within 3 to 6 years, making it a valuable long-term investment.

Thinking About Upgrading? Here’s Why the SLP99V Stands Out

When it comes to heating your home, not all furnaces are created equal—and the Lennox SLP99V proves it. Yes, it’s a premium model. But it’s also one of the smartest long-term investments you can make if comfort, energy savings, and quiet performance matter to you.

Let’s break down exactly what you’re getting—and whether it’s really worth the extra dollars.

What You Actually Get with the SLP99V

This isn’t just another furnace. The SLP99V is Lennox’s best-performing unit, loaded with features that deliver real-world benefits:

Up to 99% AFUE — meaning nearly all your fuel turns into usable heat
Modulating gas valve — adjusts in tiny increments for ultra-precise temperature control
Variable-speed blower — keeps airflow smooth, quiet, and consistent
Smart compatibility — integrates with Lennox iComfort® S30 and other home automation systems
Ultra-quiet operation — often quieter than your fridge

This furnace doesn’t just heat your home—it learns your heating patterns and adapts to keep things perfectly even.

Compare It to Other Lennox Models

If you’re stuck between models, here’s how the SLP99V stacks up:

Feature	SLP99V	EL296V	ML296V
Efficiency (AFUE)	Up to 99%	Up to 96%	Up to 96%
Burner Style	Modulating	Two-stage	Two-stage
Blower Motor	Variable-speed	Variable-speed	Constant torque
Smart Thermostat	Full iComfort®	Partial support	Basic support
Noise Level	Ultra-quiet	Quiet	Standard
Installed Price	$8K–$10K	$6K–$8K	$5.5K–$7K

Bottom line: If you want the quietest, smartest, most efficient furnace Lennox makes, this is it.

What It Feels Like in Real Homes

Ask homeowners who’ve switched to the SLP99V, and you’ll hear the same words over and over: quiet, steady, and comfortable.

No more blasting cold air when the system kicks on
Even heating across every room—no more hot upstairs and freezing downstairs
Energy savings that show up on your gas bill fast
Cleaner air, thanks to constant circulation and better filtration support

It doesn’t just work better—it feels better.

Who Is This Furnace Really For?

The SLP99V is perfect for:

Cold climate homeowners who need serious heat all winter
Larger homes where zoning and temperature consistency matter
Families with kids or allergy concerns
Anyone integrating smart thermostats or home energy systems

If your furnace runs for 5+ months each year, the energy savings alone can pay off in 3 to 6 years.

What Homeowners Say

“Our old furnace would wake us up when it turned on. The SLP99V? You don’t even hear it. And the whole house stays the same temperature all day.”
— Erin W., Chicago, IL

“We paid more upfront, but our monthly gas bills dropped by $60 in January alone.”
— Dan M., Boise, ID

“Best furnace we’ve owned. Quiet, reliable, and the smart thermostat integration is a game changer.”
— Kelly J., Minneapolis, MN

FAQ: Still Debating?

Q: Is it overkill for a mild climate?
Maybe. If your winters are short and mild, you could be fine with the EL296V or ML296V. But if comfort, air quality, and quiet matter year-round, the SLP99V still delivers value.

Q: Will I need to upgrade my ductwork?
Not necessarily. But for peak performance, it’s best to have your HVAC pro inspect airflow and return sizing.

Q: Are there rebates or tax credits available?
Yes—many utility providers and state programs offer incentives for ENERGY STAR-certified furnaces like this one.

Final Word

If you’re looking for premium heating that actually makes a difference in how your home feels—and what you pay to heat it—the Lennox SLP99V is hard to beat. It’s not just a furnace—it’s a home comfort upgrade that pays for itself over time.