The National Republican Congressional Committee has reserved more than $30 million in fall airtime in 26 U.S. House districts, nearly two-thirds of which are controlled by Democrats.

The House Republican campaign arm has reserved $18.7 million for 17 Democratic seats and another $11.5 million to defend Republican seats.

The NRCC is putting more than $3 million toward targeting three Democratic incumbents in California: Reps. Ami Bera, Raul Ruiz and Scott Peters. It is also devoting more than $1 million to defending Rep. David Valadao (R-Calif.).

The committee is spending nearly $3 million targeting a pair of Democrats in Arizona: Reps. Ron Barber and Ann Kirkpatrick.

The NRCC's announcement comes as House Majority PAC, a Democratic super PAC, just made its second wave of fall reservations, dishing out $6.2 million across 22 media markets, many of which overlap with the NRCC's reserves.

In Colorado's 3rd district, where Rep. Mike Coffman (R) is one of the most vulnerable incumbents of 2014, the NRCC has committed more than $3 million to shore him up against Democrat Andrew Romanoff.

Fall ad reservations are subject to change -- the buy sizes are not set in stone.

The Republican House majority is safe this midterm year, strategists in both parties say. Democrats have virtually no shot at picking up the 17 seats they need to win the majority. House Republicans have been talking publicly about gaining seats.

Here's a full rundown of the NRCC's reserves:

Democratic-held seats

Arizona 01 $1,950,000 (Phoenix broadcast)
Arizona 02: $1,000,000 (Tucson broadcast)
California 07: $960,000 (Sacramento broadcast)
California 36: $490,000 (Palm Springs broadcast)
California 52: $1,700,000 (San Diego broadcast)
Florida 26: $1,400,000 (Miami broadcast and cable)
Georgia 12: $800,000 (Augusta and Savannah broadcast)
Illinois 10: $800,000 (Chicago broadcast and cable)
Illinois 12 and 13: $1,440,000 (St. Louis broadcast) *split buy for total
Minnesota 07 and 08: $3,200,000 (Minneapolis broadcast)
New Hampshire 01 and 02; Massachusetts 06: $2,200,000 (Boston and Manchester/broadcast and cable)
New York 01: $1,100,000 (New York cable)
New York 21: $780,000 (Albany and Watertown broadcast)
West Virginia 03: $1,600,000 (Bluefield-Beckley and Charleston-Huntington broadcast)

Republican-held seats

California 21: $1,025,000 (Bakersfield and Fresno/broadcast and cable)
Colorado 06: $3,300,000 (Denver broadcast)
Florida 02: $900,000 (Tallahassee and Panama City broadcast)
Illinois 12 and 13: $1,440,000 (St. Louis broadcast) *split buy for total
New York 19: $1,040,000 (Albany broadcast and cable)
Pennsylvania 06 and 08; New Jersey 03: $1,800,000 (Philadelphia broadcast)
Virginia 10: $2,800,000 (Washington broadcast and cable)