How many square feet does a 4.5 ton heat pump cover?

About 1,800 to 2,250 sq ft by the common rule of thumb of one ton per 400 to 500 sq ft. The U.S. Department of Energy warns that rule ignores your climate and insulation, and recommends a contractor's load calculation (Manual J).

Can I buy a 4.5 ton heat pump online?

Not from Goodman, the brand sold on Amazon here: it makes 4-ton and 5-ton units, but no 4.5-ton. Some brands that sell through installers make one, and the certified list below has them.

Should I round down to 4 tons or up to 5?

Let the load calculation decide. A unit that is too big cools the house before it dries the air and turns on and off more; one that is too small runs longer and leans on backup heat in cold weather.

How much does a 4.5 ton heat pump cost installed?

A ducted heat pump typically runs $11,500 to $21,000 installed at 4.5 tons, $11,000 to $20,000 at 4 tons and $12,000 to $22,000 at 5 tons, equipment and labor together.

Can I buy a heat pump online and keep the warranty?

Yes, if a licensed dealer installs it. Goodman says it gives no warranty on equipment a homeowner buys online unless the unit is installed by a dealer who follows all federal, state and local codes and licensing rules. Line up the installer before you order.

54,000 BTU (4.5-Ton) Heat Pumps: What to Buy Instead

By Erin Rose · Updated November 10, 2026

A 54,000 BTU heat pump is a 4.5-ton system, for about 1,800 to 2,250 sq ft by the common rule of thumb. Goodman, the brand sold on Amazon here, makes no 4.5-ton unit. Let your installer's load calculation choose 4 or 5 tons, then buy the 4-ton Goodman system ($4,910.07) or the 5-ton ($5,643.27) on Amazon.

The two sizes to choose between

If the load calculation says 4 tons or a little more
Goodman GLZS4BA4810 + AMST48CU1300
15.2 SEER2, 7.8 HSPF2 (AHRI). Outdoor unit + air handler.
$4,910.07 on Amazon
If it says closer to 5 tons, or your winters are long
Goodman GLZS4BA6010 + AMST60DU1300
14.5 SEER2, 8.2 HSPF2 (AHRI). Outdoor unit + air handler. Makes 27,600 BTU of heat at 5°F against 20,000 for the 4-ton.
$5,643.27 on Amazon

Have a ducted heat pump? What you can buy for it

An installer fits a ducted heat pump. You can buy and fit its thermostat and filter yourself. Set the thermostat to keep the backup electric heat off above 35°F, the rule Oregon's Energy Trust gives its installers. Wall-mounted mini-splits run from their own remote, so these two are for a system with ducts.

Thermostat for a heat pump
Google Nest Learning (4th gen)
Its spec page lists control of a heat pump's backup and emergency heat, the costly stage to keep in check.
$229.95checked Nov 11
Check price on Amazon →
MERV 11 filter · most homes
Amazon Basics, 16x25x1, 6‑pack
$5.73 a filter.
$34.38checked Nov 11
See Aerostar on Amazon

Buy the filter in the size printed on your old one, and change it every 60 to 90 days (EPA). Not 16x25x1? Pick your size: the same picks in 15 sizes. Thermostat picks: smart thermostats.

What it costs

How you buy it	Typical price
4-ton outdoor unit + air handler, on Amazon	from $4,910.07
5-ton outdoor unit + air handler, on Amazon	from $5,643.27
Ducted heat pump, 4.5-ton, installed by a contractor	$11,500 to $21,000

Amazon prices read today. Installed prices are U.S. typical for a replacement on existing ductwork, equipment, labor and permit together, from EnergySage, Modernize and other published 2026 data (compiled July 2026).

Before you order one online

Book the installer first. Goodman says it gives no warranty on equipment a homeowner buys online unless the unit is installed by a dealer who follows all federal, state and local codes and licensing rules. Charging the refrigerant needs EPA Section 608 certification.
Get the load calculation. It decides 4 or 5 tons. When you replace a 4.5-ton unit, ask the installer which way to go for your house.
Buy the system, not just the outdoor unit. The rating is for the outdoor unit and air handler together.

Every 4- and 5-ton Goodman heat pump we matched on Amazon (4)

4- and 5-ton Goodman heat pumps on Amazon: what is in the box, certified SEER2 and HSPF2, heat at 5°F and price
Unit	In the box	SEER2	HSPF2	Heat at 5°F	Price	Buy
Goodman GLZS4BA4810	Outdoor unit only	15 to 15.2	7.5 to 7.8	20,000 to 23,200 BTU	$3,169	Buy
Goodman GLZS4BA4810 + AMST48CU1300	Outdoor unit + air handler	15.2	7.8	20,000 BTU	$4,910.07	Buy
Goodman GLZS4BA6010	Outdoor unit only	14.5	7.5 to 8.2	27,600 to 29,400 BTU	$3,661.21	Buy
Goodman GLZS4BA6010 + AMST60DU1300	Outdoor unit + air handler	14.5	8.2	27,600 BTU	$5,643.27	Buy

Certified AHRI figures with Goodman's own indoor units; for an outdoor unit alone, the range across them. Prices read on Amazon today.

Questions buyers ask

How many square feet does a 4.5 ton heat pump cover?: About 1,800 to 2,250 sq ft by the common rule of thumb of one ton per 400 to 500 sq ft. The U.S. Department of Energy warns that rule ignores your climate and insulation, and recommends a contractor's load calculation (Manual J).
Can I buy a 4.5 ton heat pump online?: Not from Goodman, the brand sold on Amazon here: it makes 4-ton and 5-ton units, but no 4.5-ton. Some brands that sell through installers make one, and the certified list below has them.
Should I round down to 4 tons or up to 5?: Let the load calculation decide. A unit that is too big cools the house before it dries the air and turns on and off more; one that is too small runs longer and leans on backup heat in cold weather.
How much does a 4.5 ton heat pump cost installed?: A ducted heat pump typically runs $11,500 to $21,000 installed at 4.5 tons, $11,000 to $20,000 at 4 tons and $12,000 to $22,000 at 5 tons, equipment and labor together.
Can I buy a heat pump online and keep the warranty?: Yes, if a licensed dealer installs it. Goodman says it gives no warranty on equipment a homeowner buys online unless the unit is installed by a dealer who follows all federal, state and local codes and licensing rules. Line up the installer before you order.

Every certified 4.5-ton heat pump (409)

The systems below are certified at about 54,000 BTU, ducted and ductless, and are sold through contractors. If an installer quotes one, find it here to check its efficiency and how much heat it keeps on a 5°F day. The table shows the 20 with the highest HSPF2; the full product list has all 409.

Brand & model	HSPF2	Capacity	Heat at 5°F	$/MMBtu	Buy
SAMYOU VUH60-VA6BA(0)	10.8	4.5 ton	44,500 BTU	$17.44	installer
1HVAC ACIQ-55Z-HH-M6C	10.7	4.5 ton	48,000 BTU	$17.60	installer
1HVAC ACIQ-60ZPL-HP230C	10.7	4.5 ton	54,000 BTU	$17.60	installer
AI AIR CONDITIONING A6MO23-55N2-M1H	10.7	4.5 ton	48,000 BTU	$17.60	installer
AI AIR CONDITIONING ASO25-60N2-M2H	10.7	4.5 ton	54,000 BTU	$17.60	installer
MAINLINE ML55HP230MULH-O	10.7	4.5 ton	48,000 BTU	$17.60	installer
MAINLINE ML60HP230LCMH-O	10.7	4.5 ton	54,000 BTU	$17.60	installer
Breeze33 BZ33-HYP556Z2-454-G3-P	10.7	4.5 ton	48,000 BTU	$17.60	installer
Breeze33 BZ33-HYP55OUT2-454-G3-P	10.7	4.5 ton	54,000 BTU	$17.60	installer
Carrier 37MBHAQ58AA3	10.7	4.5 ton	54,000 BTU	$17.60	installer
Carrier 37MGHAQ55FA3	10.7	4.5 ton	48,000 BTU	$17.60	installer
Midea D5CLHAH58AAK	10.7	4.5 ton	54,000 BTU	$17.60	installer
Midea D5CMHAH55FAK	10.7	4.5 ton	48,000 BTU	$17.60	installer
KEEN Home KEENHYZHP55AA	10.7	4.5 ton	48,000 BTU	$17.60	installer
KEEN Home KEENUMHP60AA	10.7	4.5 ton	54,000 BTU	$17.60	installer
C&H CH-RHP55M-230VO	10.7	4.5 ton	48,000 BTU	$17.60	installer
Cooper&Hunter CH-RHP60LCU-230VO	10.7	4.5 ton	54,000 BTU	$17.60	installer
Multi MFG 55MPC6-HH-B	10.7	4.5 ton	48,000 BTU	$17.60	installer
Multi MFG MSH-60HD-B	10.7	4.5 ton	54,000 BTU	$17.60	installer
CanAir 4C28LCH60H21	10.7	4.5 ton	54,000 BTU	$17.60	installer

Capacity and efficiency are AHRI-certified values; $/MMBtu is computed by us from EIA energy prices — see methodology. Heat at 5°F is the number that decides whether a heat pump keeps up in real cold, and most listings omit it.